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You may want to avoid these ingredients in cannabis oil vape cartridges

July 31, 2017
By now, you’ve probably seen or tried firsthand a vaporizer with an oil cartridge. These portable vaporizers are becoming increasingly popular as they’re easy to dose and operate. Visiting a dispensary, you’ll notice different brands made with different strains, solvents, and additives. Which ingredients are safe, and which ones should be avoided?

Burning cannabis oils can produce some of the same free radicals that are formed when you burn cannabis or tobacco, which is why people have turned to vaporizing (vaping). Vaporizing means that cannabis is heated without combustion. Active ingredients are released by the heat into a fine-mist vapor. Since combustion does not occur, smoke is not created.


The Best Discreet Vape Pens and Portable Vaporizers

People who vape cannabis perceive vaping to be safer and less harmful to their health than smoking. Cannabis vaporizers are specifically designed for inhalation without harmful smoke toxins, but how safe are materials being inhaled?

Harmful agents to avoid in cannabis oil

When vaporized, cannabis oils are frequently mixed with thinning agents for better performance in a vaporizing device. However, when some thinning agents are heated, potentially harmful carbonyl compounds can be produced.

Carbonyls are a group of cancer-causing chemicals that includes formaldehyde, which has been linked to spontaneous abortions and low birth weight. A known thermal breakdown product of propylene glycol, formaldehyde is an International Agency for Research on Cancer group 1 carcinogen.

Research in this area first began with e-cigarettes. Cannabis and e-cigarettes use different thinning agents and are heated and vaporized at different temperatures, but there are parallels that have now led researchers to begin similar research on cannabis thinning agents.

However, there is no research regarding heating of thinning agents in vaporizing devices specifically designed for cannabis. Most research of this nature has been done on e-cigarettes, which have been around for nearly a decade. One of the first studies was a 2015 study in the New England Journal of Medicine that showed hidden formaldehyde in the aerosols of e-cigarettes.


How Vaporizing Concentrates Can Customize the Cannabis Experience

In a very recent* August 2017 study, a team of researchers summarized the e-cigarette pulmonary toxicity by looking at human studies, animal models and cell culture studies. They described the field of research as rapidly evolving and identified research gaps and challenges, but warned that when heated to high temperatures, propylene glycol can break down into microscopic polymers that can cause damage to lung tissue.

Another 2017 study conducted at the Medical Marijuana Research Institute in Arizona, researchers looked at the byproducts produced when vaporizing cannabis oil. These popular cannabis thinning agents were studied:

  • Propylene glycol (PG or PPG)
  • Vegetable glycerin
  • Polyethylene glycol (PEG) 400
  • Medium chain triglycerides

These thinning agents were heated to 230°C (450°F), and scientists tested the resulting vapors to detect the presence of harmful compounds like formaldehyde, acetaldehyde, and acrolein.


Is smoking cannabis bad for you?

The results showed that polyethylene glycol 400 produced much higher acetaldehyde and formaldehyde byproducts than the other three agents. Heating of the thinning agent propylene glycol also produced significantly greater formaldehyde byproduct. Researchers concluded that individuals who vaporize cannabis oil utilizing these thinning agents may risk harmful exposures to the byproducts.

Furthermore, there has been a lack of adequate safety testing for the vape pen devices. Pre-packaged oil cartridges are not well labeled in some cases, and thinning agents are frequently developed in countries that have no regulatory controls. There are many vape pens on the market, all of which have a different heating source with different activation and temperature.

But is there conclusive evidence that vape pen consumers will develop pulmonary illnesses or cancers? No. Very little is known about either short- or long-term effects of inhalation of thinning agents like propylene glycol and others.

Thinning agent alternatives in vaporizer cartridges

Producers of vaporizer cartridges are making a mass exodus away from these thinning agents due to their health risks and the unpleasant taste they tend to carry. Instead, many are turning to terpenes as they help thin the oil while improving flavor. Others are using different extraction methods such as CO2 extraction to achieve an oil thin enough to be consumed in a cartridge without the need for additive thinners.

As vaporizing oil cartridges becomes more popular, products specifically designed for this purpose are emerging in the marketplace. When purchasing oil cartridges for your portable vaporizer, check the ingredients to see if propylene glycol and/or polyethylene glycol 400 are listed. If so, you may want to avoid them and reach for an alternative product that utilizes terpenes or more health-conscious thinning agents.

*Update 8/22/17: Since the original publication of this article, a new study from the American Physiological Society on pulmonary toxicity was released. It has since been added to this article’s analysis.

Jacqueline Havelka's Bio Image

Jacqueline Havelka

Jacqueline Havelka is a contributing writer for Leafly. She's a rocket scientist turned writer, having worked in the space program for many years managing experiments on the Space Station and Shuttle. Jacqueline currently owns her own firm, Inform Scientific, specializing in technical and medical writing and research program management. When she’s not writing, she is likely watching college football.

View Jacqueline Havelka's articles

  • NetRider

    Who the ‘F’ vapes at 450 degrees? Lame. Show me a study done at temps that people Vape at! Hell, there are compounds found within cannabis that are toxic at certain temps. I call BS until I see it done at temps people vape at. Show me 710 degree + temps and I may consider this as valid research!

    • MrBogus

      Typical vape temps are under 500ºF.. I am in a unique position as I produce vape products and own a vape business.. My main work is in an immunology office and deal with inhalers/vaporizers on a daily basis as well as we do clinical research studies…

      Sad fact is that people produce “information” on the net that is neither accurate nor backed by any scientific study data.. Valid research takes a lot of time and controls, we deal with controllers and the FDA on a regular basis and I am pretty sure a guy in his garage is unable to say very much about any of this with any authority..(myself included in some aspects of this)

      They read “data” out of context and then apply their own spin to it. My bet is 99% of these “experts” are unable to actually read a study and “comprehend” what they were just told…. I do this daily and am always hitting reference materials to figure out just what I am reading…

      Just gets old, produces undue concern and infringes on people right to do what they want without harming others.. I am a big boy and don’t need a nanny unless she is 20 something and hot as hell…

      • Jack Pine

        You are absolutely right. There is so much misinformation out there. Do you think it’s ok to use cartridges with VG or PG. I’m totally confused. I’m in Canada and licenced producers aren’t allowed to produce cartridges so I’m limited as to where I can purchase them (on line or on First Nations territories). I’m leary purchasing them on line and not sure if I’m being told the truth on the reserves. Thanks

    • Jerry C

      I’ve never vaped at anything higher than 420 degrees F and no, I’m not saying that just to say 420….maybe this is why I still prefer smoking, because it’s a nicer feeling. Vaping often makes me feel like I’m being suffocated.

      • NetRider

        If you’re lucky enough to afford a digital nail or vape great. *MOST* can’t or use a pen. Even those that have digital nails etc. will generally ve above that temp. IMO that’s even too low for a low temp dab! If were talking pens, then people need to research their specific pens because most get waaaaaay hotter than 450 especially when people keep mashing the button down for bigger/longer hits. And since were talking about a thunning agent, were talking about pens. Again MOST burn a lot hotter than 450 ! I stick to my guns and await a better study. I can see how at 450 you still have the additives but at higher temps?, what happens? C’mon we have 710 day for a reason. Tell me what happens to that shit when its burned at a more realistic temp. Regardless I dont use carts because they have no power. Give me LR please!

        • RM Wolfe

          What is a digital nail? I’ve searched for it online, and only find reference to fingernail art.

          • Two Bears

            a digital nail is often called an electronic or eNail.

            it uses electricity to heat a dab rig. they are usually vape shatter, crumble, pull and snap, or Rosin at temperatures of 400-1000 degrees Fahrenheit.

      • Two Bears

        the reason they need higher and higher wattage is the INSANE coils used now.

        those stapled Clayton coils and others need a 50 Watts to get any vapor.

        when I vape I use single coil I build to .8 ohms, and I can get vapor as low as 4.5 Watts and a satisfying vape at 8 Watts.


  • Ls Love

    What were the results of the Medium chain triglycerides?

    • A Z

      Lipid pneumonia/lipid lung.

      • Lipids are also used in asthma medications to transport the meds. Lipids are not automatically bad and that is another misconception about canna extractions as well.

  • MrBogus

    Oh these type of articles are like hearing that feeding your pet rat 1oz of sodium cyclamate a day causes cancer… This is later backed up with eating 10lbs of bacon a day is bad for you…

    A smarter person than I said that “If you torture the data long enough, it will confess”

    I would genuinely like to see the full study as to compare to established studies compared with VG/PG/ VG-PG done for ecigs …

    This summary singles out PEG400 (not used in ecig industry) and then groups VG/PG together as things to “avoid” as producers of acetaldehyde and formaldehyde byproducts.. VG you will find is pretty much inert in these studies until exceedingly high temps are encountered (far above normal vape temps)..

    PEG400 is NOT used in the EC industry by any producer that I know of (and I happen to know just a few).

    The levels of these compounds (carbonyl compounds ) are something in the neighborhood of 1/200th~1/400th that of a conventional cigarette as they are found in typical vape devices..

    While I agree that avoiding known carcinogens is a good idea, this type of article does not help anyone IMHO.. I would be far far more concerned with what the growers are inducing while growing…..

    Grouping the 3 compounds together (Vegetable glycerin, Propylene Glycol and polyethylene glycol (PEG400) might just be irresponsible in much the same way that grouping texting, drinking and smoking pot while driving is dangerous…

    • Two Bears

      The Royal College of Physicians determined that vaping is 95% safer than smoking

    • 360dunk

      I disagree, MrBogus….the article is very informative and your attempt to mitigate the effects of formaldehyde is weak. Everyone knew that eating 10 pounds of bacon/day would be unhealthy, however, hardly anyone knew about the vaping by-product dangers. Furthermore, some of us don’t share the same concern about our local growers. Our state, for one, tests all dispensary products and ensures there is no presence of molds and pesticides.

      • Useyourhead

        He was pointing out something you so eloquently misunderstood; That statistics don’t like but liars use statistics.

        These ‘facts’ and figures can be used anyway by anyone for their purposes and gains.

        It is highly doubtful that the cannabis industry is doing to us what the tobacco industry did to smokers. If that were the case they’d be putting some highly addictive additives in and not a cutting agent to make the oils usable.

        For many of us the benefit of vaping OIL is that there is no odor associated with our use of this medication.

        I don’t think the same can be said of your (totally unrelated to this article) mentioning of dry flower vaping.

      • Aquaticspastic P

        it really isn’t informative in the slightest, it’s just a reference really but honestly you’re expressing your opinion and thats fine but the fact is that they don’t even go into great detail on the subject at hand i mean they don’t even tell us an alternative to use, i beg you to point out the informative bits…

    • I definitely agree with you. My understanding is that the vegetable glycerin is the only one of the three that is safe.

      • Two Bears

        Actually no. PG Propylene Glycol is safe. its used in hundreds of different ways. Everything from Asthma inhalers to Ice cream and beyond. there are some that are allergic to PG but it won’t kill you. now the other two glycols are VERY DANGEROUS Ethylene glycol and polyethylene glycol can kill you.

    • Raymond Norcross

      totally agree they used the article as a blanket scare tactic not actual facts regarding vg mct with both producing far less formaldehyde but as you stated is questionable due to the lower temps that are being vape mine runs about 290 degrees far less then the 450 they run their test at

  • Two Bears

    Ethylene glycol is NOT usef in eJuice. Thats the poisonous substance in antifreeze.

    Poly Ethylene glycol is the chemical in the Mira Lax laxative.

    The author should have done research instead of coming across like a fool.

    • MrBogus

      I did not see the reference to Ethylene glycol but yes it is a direct relative to “Propylene Glycol” and both are used at coolants in one form or the other.. Ethylene is the toxic cousin and is the typical “green” antifreeze most are used to seeing.. bad stuff…

      • Two Bears

        The author mentioned P E G Poly Ethylene Glycol.

        Propylene Glycol is safe.that is the carrier for most asthma inhalers like alvuterol.

        Poly Ethylene glycol is in the Mira Lax laxative.

        Ethylene glycol is the chemical in antifreeze that kills dogs and cats.

        PG and PEG are safe.
        EG is not.

        • besommer

          The difference is that PEG in vaporizers is heated while PEG in asthma inhalers and Miralax isn’t.

          • Very good point–it seems to be the degree of heating (that can yield carcinogens) when heating cannabis oil that is problematic.

          • Two Bears

            big point here. in asthma inhalers what enters your lungs is over 90% PG. I don’t like a hot vape. for those that do its on them.

            PG is safe up to about 425 degrees. in those cloud comps that eJuice is only about 5-15% PG .

            I used 8-10 Watts and the vapor coming out of my lungs was cooler than the skin on my face.

        • Polyethylene glycol (400) is NOT safe–I’ve done a LOT of research on this–the jury, however, is out on Propylene Glycol.

          • Two Bears

            Ethylene glycol is deadly.

            I was talking about propylene glycol.

            Propylene glycol is used in HUNDREDS of items every single day.

            Animal safe antifreeze

            Asthma inhalers

            ice cream makes it soft and scoupable

            flavor extracts

            EJuice for eCigarettes

            and thousands more.

      • Two Bears

        yes propylene glycol can be used in antifreeze. they switched from ethylene glycol to propylene glycol (PG) to make animal safe antifreeze. PG is also used in ice cream, flavor extracts, ecig eJuice, and asthma inhalers. if PG was dangerous the people with emphysema and asthma would be dropping like flies.

        I vaped almost 5 years to break a 38 year cigarette addiction. I have both asthma and Crogns. my immune system is seriously compromised from the crohns and I have used PG in various ways for 50 years.

  • Open Minds

    There is no need to cut your cannabis oil with any substance when vaping it. Just look for products that state 100% cannabis oil.

    • Jay

      If you are using basic pens and carts and crappy stuff like that you do or you are wasting a lot. Its too viscous to wick without burning and clogging. Especially 100%. But if you use good wicks and make your own coils on temp devices then no, you dont need thinners.

    • Dawn Michael

      100% cannabis oil = shit I wouldn’t feed my dog. True extracts of clean product yield around 40-90% thc with a boatload of other compounds to make it full spectrum.

      • Two Bears

        Thats your opinion. it may stink but its your opinion and you’re welcome to it.

        I use concentrates for my Crohns disease every day for the last two years. the buds didn’t give me consistent relief. concentrates DO! I went 6 months and two days between my two most recent flares. its been almost 3 months since my last flare. With buds I was only able to go 4-6 weeks between flares.

    • Two Bears

      You’re wrong about that. pure hash oil is thick and viscous.

      They dilute the hash oil so the oil is thin enough to be carried to the coil via the wick.

      there are atomizers such as the X Vape V One, the Kiln Ecapple Miracle and others that easily vape the pure hash oil. but most vape pens work by the ololtech,,, wick carries the oil to the coil.

    • Jerry Cox

      I buy concentrate…it’s like goo…most people use it for dabbing…but I have found that by thinning it…I can vape it…and it cost about half or less the cost of the cartridges in the dispensaries…

  • Stephanie Pontier Gilbert

    I smoke sometimes, I vape with oil cartridges and I also use a Pax. It heats up the flower and then you take a hit. It doesn’t burn your throat and is easier on the lungs.
    Is this considering better than the oils??

    • Martha Alvarado

      I use the Pax2 as well and I definitely feel it’s better….the oil is great too but sometime you really dont know what in it

  • @redbear2257

    I use coconut oil its really good i decarb equal amounts of shatter,wax, with egual amounts of coconut oil. 1gram to 1gram. It works perfect also it is good for asthma patients

    • Bryant

      Very bad, please don’t vaporize and inhale this

      • @redbear2257

        Did u decarb the shatter with coconut oil and use heat or just mix it?

        • Ivan van Ogre

          This is how people are winding up in the hospital!

    • Two Bears

      i would only use infused coconut oil for edibles.

  • Jeremy Shepherd

    The article demonstrated that MCT Oil released 0 carbonyls (if I remember correctly) and that VG was rather safe. PG didn’t show detrimental amounts of carbonyl production until 230°C. PEG-400 was terrible at most temperature.

  • Highway 69

    Your best bet is to vape your flower in a quality vaporizer with temperature control settings. Stick to dry herb. Better than smoking!

    • kristine08

      The article is about vaping oils……

      • Highway 69

        I read it, and was pointing out that “vaping” without these oils is infinitely better.

        • It seems that it’s the thinning agents that are added to the oils (like Propylene Glycol and Polyethylene Glycol 400) that make vaping cannabis unsafe. If it wasn’t that I am an ex smoker that has had bouts with bronchitis all of my 69 years, I would do edibles or pills if it wasn’t that it takes so long to really feel the effects.

          • Two Bears

            Polyethylene glycol is deadly.

            PG (propylene glycol is used in asthma inhalers, ice cream, animal safe antifreeze flavor extracts, and hundreds of other ways.

          • m1keC

            You’re thinking of just “ethylene glycol” (antifreeze). PEG400 is used in many products and has a GRAS rating from the FDA

          • Highway 69

            Yeah, edibles are a whole different ball game.

            I responded to your other comment below, but in addition to vaporizing dried herb, you can also use your vaporizer with lavender, eucalyptus, or a variety of other aroma therapy plants.

          • Akiko Fujishima

            Have you ever considered cannabis tea? I often brew it from my left-over herb from making edibles, but you can just do the same with decarbed cannabis, rather than using the left-over decarb from your canna-oil. Since it’s liquid, you feel the affects sooner than you do with edibles. So have the tea, while enjoying an edible, and one will carry over to the other and you’ll have a faster affect, but a lasting one due to the edible picking up where the tea left off. The affects from the tea wear off sooner than edibles.

    • CATRYNA49


    • Gail Hines

      Agreed. I use “Plenty” by Storz & Bickel. Had a Volcano but the buttons broken to frequently. Although the company will repair them whether under warrenty or not. I find the plenty is excellent. IMHO

      • Highway 69

        Storz & Bickel makes outstanding vaporizers. I have their “Mighty” model, which is on the expensive side, but well worth the money.

        • How expensive is the “Mighty?” I think that vaporizing pure flower might be the safest way to ingest cannabis (second only to edibles).

          • Highway 69

            It retails for about $350. It’s worth the money, and yes, I think when you don’t burn your herb, it is safer than smoking or vaping with a pen, (which uses the liquid filled cartridges).

            Combustion occurs at 451° F, and the optimum temperature for convection vaping flower is about 100 degrees lower than that!

    • julius

      Agree 100%

    • Adan de la Pena

      you mean like the ones they advertise all over the page. hmmmmmmmmmmmmmmmmmmmmmmmmmmm

    • Jonathonsdaddy

      I agree as long as you know if the cannabis is grown organically , no pesticides or growth additives used !
      You can buy from farms directly in CA , my favorite is Phenix Cannabis .
      They have a good selection but do not carry flowers with High CBD levels .
      I try to medicate with a 1 : 1 ratio of CBD and THC , these 2 cannabinoids work together perfectly
      at that ratio …… Vaping flowers is the best way to do this , safely ….

    • Ivan van Ogre

      I use the Pax Era because it has good temperature control/battery life and it’s an excellent product.
      But what I would really recommend is the DynaVap ‘M’ with a stainless steel screen and titanium tip.
      It’s the best vape you’ll ever have and it’s high-quality too.

  • Bill Hennessey

    I have cartridges with no info on them as to additives/dilutants. How can we tell?

    • Jerry C

      Same here…been using Eureka cartridges. Says no additives and it’s thick like tar but I have no way of knowing how the oil was extracted

      • Two Bears

        Most of the non runny concentrates are extracted via super critical CO2.

        Recently they have been dilemmating concentrates with terpenes. the liquid terpenes I have seen are super expensive like $80 for 2 ml.

    • kristine08

      I am in the US (right now) and the dispensaries HAVE to test and it is on the side of the cartridge, and on the outside of the packaging.
      When I am in Jamaica, everything is free of “crap”. The food, the giant sticks of ganja….zero worries when inna mi yard.
      A grocery bag of ganja in Jamaica is about $50.00-$75.00/US.
      It’s a beautiful thing~

      • Two Bears

        only some states enforce testing and full disclosure.

    • Silverado

      Avoid the flavored carts first and foremost. Look at the net weight info and usually if there’s any additive it would say so there by being a little heavier than .5 grams due the thinning agent. Look for PURE cannabis oil or made with Co2 (which are pure oils) etc etc on the label and ask the budtenders as they’d know all about which ones have flavoring or glycol added. Pricing can be a giveaway too as anytime say 1 gram seems cheap ALWAYS read the label or again ask those budtenders. They want you happy when you walk out so that you’ll return and spend more of that cash on what they’re selling hoping you’ll tell your friends too.

  • A Z

    What a misleading garbage piece, shame on you Leafly for spreading bad information. You have cherry picked what you wanted consumers
    to read out of this non-peer researched, unreplicated study. What about the MCT’s you mentioned? What about lipid pneumonia? I wouldn’t be surprised if this piece was written for a lab to further their vape pen sales. Do you know how dangerous the wicks in vape pens are? Those are what are not meant to be heated for prolonged periods of time or at high temps. This isn’t the first fear-mongering piece I’ve read on Leafly, but it’s the last. I’m done with this site.

    Per the study:

    E-cigarette research shows that heated thinning agents produce
    potentially harmful carbonyls; however, similar studies have not been
    conducted (1) with agents that are commonly used in the cannabis
    industry and (2) at temperatures that are appropriate for cannabis oil

    • Two Bears

      Apparently you aren’t as smart as you think you are. the Royal College of Physicians in the UK evaluated the risks of vaping and determined that vaping was determined to be 95% safer than smoking.

      you brought up the wicks in vape pens. Originally used sillica. that was YEARS ago. now they primarily use organic cotton and Rayon. Rayon is celulose from wood

      the wire the coil/coils are made from scares me a hell of a lot more than the wicks used.

      nickel and titanium oxide in the lungs are far more dangerous

  • Jay

    I’m not even sure why people have been using such outdated technology for errl like carts and clearos anyway. Ecig users have known for a few years now that thick eliquid doesnt work well and our concentrates are waaaaaay thicker, so why do people keep using them?! The ecig world has so much to offer us concentrate vapers its not even funny. Just grow some sense and look around and you wont even need much thinners, with some devices and toppers, like temp controlled wire type drip attomizers, you wont need any thiners at all. I have been using temp wire and ready x wick on a temp control device for a long time now. No worries about burnt wicks, clogged wicks, burnt terpenes, wasting thc, acrolyns from thinners and so on.

    And stop buying prefills too. Make your own rigs and run your own extracts, and you know what you got.

    • Ivan van Ogre

      I don’t have the room, the money or the time!

  • Kc Weck

    If you hit it out of a proper tank on an ecig where your liquid wicks properly, you should have 0 chance to produce those “toxins”. Big pharma already tried to bs that study, you have to be burning the crap out of your coil while vaping in order to get those toxins to begin forming, so do some research, if you have already activated thc mixed with vg or pg you will never get to the point of releasing toxins while vaping the tank, that’s why you boil your thc in the glycols to break it down and activate them, so yea read up on your stuff and that includes you leafly.

  • NC91

    why do disposable vape pens never seem to be strong enough?

    • Silverado

      Forget those expensive under-performing things!! Get a variable voltage battery like the Vision Spinner II (Google it and then buy it on Ebay) where you can match the voltage to the cartridge. Mine has voltage selections between 3.3 and 4.8 volts and works great on just about all cartridges. Right now I see mine is set on the 4.3 volt selection and the cart that’s in there works great! Different brands of carts can typically use different voltage settings in my experience. Most carts can be refilled so buy what you like. And then you’ll get a pull like you’re hoping for. Ask the budtenders too as they’d know what everyone seems to be buying and using. Good luck!

  • Lastchance

    What about coconut oil potentially causing lipid pneumonia??

  • Karl Warner

    Once again I wish a list would be made stating which companies use/don’t use these potentially harmful products.

  • Richard W. Campbell

    Here in the State of Florida, flower cannot be sold legally at a dispensary. Only, oil is allowed. However, a lawsuit has been filed against State to allow flower to be sold at a dispensary. I’m sure we will win.

  • Richard Powell

    Can anyone reccomend good cartridges to get from dispensaries that don’t have any harmful ingredients. I’ve had BaM (body and mind) before an it tasted really good.

    • Silverado

      Just ask the budtender as they’ll know. Just ask what their best seller is and buy one of those. Seldom would you go wrong doing that. Personally I never buy the most expensive of anything as I’m more of a middle of the road shopper for quality AND price. And they’ll have cartridges in all price ranges or should. And if they don’t you’re in the wrong place. Good luck!

  • Dan Stegner

    I’ve been making my own with my own heart pressed wax and terpines.. While not cheap terpines add amazing flavor and as the article mentions thins out the consistency perfectly

  • Harut Tash

    hello, does anyone know a formula or recipe to use as cutting agent for honey oil? Much appreciated!

    • @redbear2257

      50 50 ratio coconut oil or vg do not use ppg

      • Two Bears

        I think you mean PEG. Polyethylene GLycol is used in miralax a laxative.

        Vegetable Glycerin is horrible at absorbing cannabinoids.

        if you use coconut oil DON’T VAPE IT!

    • Two Bears

      if you’re going to vape it. About the only way to go is PG Propylene glycol. the same stuff used in asthma inhalers.

      NEVER USE ETHYLENE GLYCOL! That stuff is deadly.

  • Yandl Tumsiklo

    If you read the medical journal, it states formaldahyde is only present at high voltage vaping (5 volts) and at 3.3 volts no formaldehyde is present. Little vape pens are not even 3 volts. So therefor there is no hazard assosiated with any of the ingredents listed in terms of cancer caused by formaldahyde.

    • Useyourhead


  • Jay Bone

    I recently got my MMC and have been trying different ways to medicate…and have settled on vaping oil (concentrates) and yes I do use PG for a thinning agent…starting to rethink that though…what is a better choice for a thinning agent….coconut oil? veg oil?

    • Two Bears

      NEITHER IF YOU INTEND TO VAPE IT. did you know that propylene glycol is used as a carrier in asthma inhalers?

  • Jerry Cox

    I have changed from Propylene Glycol to XMC oil…as a thinning agent and it seems to be working nicely…anyone have any comments?

  • Jaime VG

    I wonder if Propylene Glycol and other thinning additives are safe to consume if you just take drops of cbd under your tongue. I take flavorless Koi cbd but it has Food Grade Vegetable Glycerin, Propylene Glycol, Natural & Artificial Flavorings which I´m not sure if they should be added.

    Does hemp bombs contain these ingredients?

  • Michael Marion

    I hash oil and it has coconut oil in it mainly used for edibles baking can I Vape this

    • Most likely, yes. Not all oils are ‘vapable,’ They must be able to soak into membranes and not sit on top of them. Coconut (MCT) should be ok, vegetable oil is not ok. Note there are no long term studies yet.

  • Adam Hefner

    So MCT isn’t as safe as they market it? How do you vape leaf with you vaporizer? Im new but I can’t see how to perform the best harm reduction toward this

  • Does anyone know if any CBD company is creating a non-thinning agent extraction of low/no THC concentrate that can be vaped?

  • Edwin Sanchez

    So I started vaping in April of 2018 and in late May I developed what i thought was an ear infection. Doctor gave me antibiotics but they didn’t work so they kept giving me different antibiotics but the infection stayed. I wasn’t until August that I informed my doctor that I vaped and they told me to stop immediately, turns out the chemicals have been killing my inner ear cells and now I have permanent hearing loss because of this. I might even need surgery to remove all the dead cells from my ear.

  • Jack

    The study mentioned above studied MCT in a vaporizer and showed minimal degradation. PG and glycerol form acetaldehyde, acrolein, and formaldehyde due to carbon carbon bond scission facilitated by the existence of the hydroxyl group. MCT doesn’t have hydroxyl groups so it doesn’t degrade as easily.
    Also, another study on inhalation of MCT oil showed that it was actually helpful patients with asthma.

    • Chase

      alright guys i got so deprived and had some coconut oil with thc that when ingested never got my high. so i tried dabbing it in my rig and yeah that shit is flammable never vaproized, went from a solid to a liquid to on fire. do not reccomend. smelled like shit.

  • Alan123

    This needs to be updated, considering the latest deaths from vaping hitting the news

  • jonny loverock

    After smoking for 30 years I moved to vaping. After around 7 months of that I felt like my brain was getting messed up and my lungs were getting gummed up. I kept losing my voice and coughing like a busted car exhaust. Then one day I turned on the radio and the first thing I heard was a news broadcast about the first vape deaths through THC use. it felt like a sign. A message I needed to hear. I binned the lot and I won’t be going back.

    They say there’s no point having regrets in life but I do. I regret spending so much cash on something I could have just as easily lived without and I regret nearly loosing the whole of my damn teeth through gum disease. I also regret lining the pockets of so many people who I used to think were my friends but who I later realised just saw me as a dollar/pound sign.

    I once went to Amsterdam and ate some space cake so potent I nearly jumped off. a damn bridge. I regret that too.

    The only time cannabis will ever enter my body again is if a doctor prescribes it for me. And even then I’ll probably hunt out an alternative if I can.

    Finally, as a massive Bruce Lee fan I was reading a book about him recently and the author said that after Bruce died they found cannabis (hash) in his stomach. Apparently he’d got into it in America and consuming it may have contributed to his death. I don’t know how true it is. But I was gutted to read that and it added to my resolve. I ain’t doing no more substances. I’m just gonna rely on water, food and oxygen through meditation to get me as high as I can be from now on.

    • GTG

      Your personal choices regarding cannabis usage are respected, as are your personal accounts but, THC is not the cause of the deaths that have been linked to vaping. Continued speculative reports, assumptions, theories, as well as mass(media) paranoia/hysteria does not help matters any.

      And, by the way, Bruce Lee died from cerebral edema, or brain swelling due to excess fluid. Hashish does not cause cerebral edema.