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Cannabis Cartridges Have a Heavy Metal Problem & It Is Worse Than Reported

Cannabis Cartridges Have A Heavy Metal Problem & It is Worse Than Reported
Photo Shelby Nelson for Cannabis Now


Cannabis Cartridges Have a Heavy Metal Problem & It Is Worse Than Reported

As testing ramps up in legal marketplaces there are more concerns about just how safe vape pens are.

Sales data from Eaze and Jane Technologies Inc. confirm that cannabis e-cigarettes (“vape pens”) account for nearly 25 percent of sales in California and other research by BDS Analytics and Arcview found that “vapes already made up more than half of total U.S. concentrate sales.” Considering that these devices did not exist until 2010 in their earliest incarnations, and did not see mass adoption on the consumer market until 2012/2014 (depending on location), these devices have taken the cannabis industry by storm. As with any new technology, while there are benefits there are also potential harms.

This month, California’s cartridge market was shaken to its core by a memo released by K Street Consulting, drawing attention to the fact that potentially 90 percent of cartridges dry test for actionable levels of lead under the state’s phase 3 heavy metals testing as required by reforms to the state’s medical and recreational cannabis programs. While many outlets have been hyper-focused on lead, there are other heavy metals to be concerned about in these devices.

Big Trouble, Little Care in China

Sasha Robinson, a founder of Firefly Vapor and their former CTO, did extensive research on material components to create the Firefly 1. Robinson said they “were testing standard heating coil wires of different types,” including nichrome wire, a blend of nickel and chromium. After a month of testing, Robinson said he and his colleague noticed they had “skin rashes and itching issues, symptoms that were consistent with those of nickel poisoning,” but they were never checked out by a doctor. Nickel poisoning is a rare disease which can be hard to diagnose and, in extreme cases, can result in coma and epileptic seizures. While both nickel and chromium are heavy metals, neither one is being tested for under California’s phase 3 heavy metals testing (just cadmium, lead, arsenic, and mercury).

Since the developers at Firefly were not using filled cartridges, they could “see that there was dust in the heating chamber when we disassembled the device” and Robinson said he noticed that “after repeated heating and cooling cycles the nichrome wire begins to flake off as white powder,” which was then inhaled into their lungs.

“I don’t want to be an alarmist in this space, we are doing a lot of human experimentation with no studies,” Robinson said.

With that realization, Robinson and colleagues conducted a lot of research “on different materials that didn’t flake under heat cycling.” Ultimately, they put the whole company on hold for about three months to make sure they had a safe product.

“In the end, we did find one, but it was very difficult to find a supplier and we had to have our wire custom made,” Robinson said. “All of our coils are now made in the U.S.”

When it comes to prioritizing human health over company profits, Robinson said he feels that “China doesn’t think that way, they can’t afford to.”

Robinson described manufacturing in China as the “wild west” when it comes to the issues U.S. companies face in dealing with Chinese manufacturers,

“The challenge is that most [U.S. brands] don’t know and don’t want to know what they are made of, because then they become liable for it,” he said. “Their supplier can tell them a lie, like the coil is made of titanium, and then they can repeat the lie to consumers without ever verifying it. That happens a lot.” While much of the market has shifted from nichrome wire to safer components, some companies have not, and others may be repeating incorrect information about product safety given to them by their manufacturer.

A Cowboy of Quality Control

To learn more about China as the wild west of vape manufacturing, Cannabis Now spoke to a long-term “cowboy” of the quality assurance/quality control (QA/QC) testing scene in Shenzhen China, Andy Church. After 12 years doing QA/QC in China, Church founded Insight Quality Services, a company that ensures that what U.S. brands order is what they receive. When I brought up Robinson’s comment about material component deception, Church said it was a common occurrence.

“I think that it happens all the time, in manufacturing and sales, but that is not limited to China,” he said.

Church put the onus on the importer.

“If someone is telling you that a device is made of specific components it is up to the buyer to make sure that what they receive is what they ordered,” he said noting that, for cartridges and any other products, the way to verify is to “send samples in from the inspected lot to make sure the components are what they are meant to be.”

Are they Actually “Vape” Pens?

You may have noticed that this article refers to cartridge-style and all-in-one disposable pens not as “vape pens,” as most people do, but as “cannabis e-cigarettes” or simply as “devices.” This is because they all use appropriated e-cigarette technology, which was not designed for cannabis oils. As previously reported by Cannabis Now, the result is a product that doesn’t always vaporize and generally smolders or combusts the oil around the heating element, which can produce carcinogens and potentially other contaminants. Some higher quality disposable devices, such as the dosist pen, include a microprocessor to control the temperature, but in a market racing to the bottom to provide the lowest prices to overtaxed consumers, most brands do not have a way to control the temperature in their device. Robinson stated it about as bluntly as one can, “Those pens have no temperature control and very few electronic parts, most of the electronics are spent on charging the battery and making sure the battery doesn’t blow up in your face.”

While many people think there is a clear line between what is vaping and what is not, it is more of a gray area than black and white.

“There is no clear line between burning and vaping, it is a scientific measurement of particulates,” Robinson said alluding to the fact that there is no one accepted temperature. In fact, perhaps temperature isn’t even the best metric to use.

Heavy Metals Testing Outside of California

While much of the focus in cannabis vape pen testing is currently on California, it is not the only state to require heavy metals testing and soon Colorado will also be implementing the heavy metals testing requirements contained in that state’s regulations. Despite Colorado testing for the same four heavy metals, the allowable limits are much less restrictive. For example, while California only allows 0.5 parts per million (ppm) for lead, Colorado will allow 10 ppm.

To learn more about heavy metals testing limits in other states, Cannabis Now spoke to Sarah Krings-Lien, a senior consultant for Pistil + Stigma and the head researcher on their multi-year study on cannabis testing limits around the United States.

“The lack of scientific evidence on safe levels of heavy metals in cannabis has resulted in a patchwork of state testing requirements,” Krings-Lien said. “The majority of states require testing for just four heavy metals (inorganic arsenic, lead, cadmium and mercury), but a few states require testing for up to 10, including chromium, barium, silver, selenium, iron, manganese, nickel and zinc.”

In addition to the dramatic variance in the number of metals tested for, Krings-Lien said that the limits for each heavy metal vary significantly.

“For example, in five states the limit for lead in cannabis flower is 1 ppm or less, while two states allow up to eight times that amount,” she said.

Safer Alternatives

For cannabis users looking for safer devices, the dosist pen and Firefly are vaporizers that have been around for a few years and have a proven track record for safety and compliance. About four years ago Cannabis Now spoke to Seibo Shen, CEO of VapeXhale and Hanu Labs, who was one of the first C-level executives blowing the whistle on the materials safety issue.

“I’ll be the first to say that pens seem to be safer than smoking, but they may not be as safe as they are being marketed to be,” Shen said. “I wouldn’t say they are unsafe, but they can choose much safer and better materials to use in the cartridges.” Since the interview, Shen has created the Hanu Stone, a portable vaporizer about to hit the market, which he said was “designed to be ROHS and ROHS2 compliant, which are safety standards for hazardous materials.”

While California and Colorado brands may be fine using nickel and chromium in their devices for now, there is no guarantee that will last forever. For brands with a national footprint, or those that aspire to have one, it is important to meet the standards of the most restrictive state the company plans to operate in and meet the standards, rather than trying to save money by buying sub-par electronics and fail testing, or worse, suffering a recall, as just happened to one Michigan company whose products tested hot for arsenic and cadmium (among other chemicals).

TELL US, are you concerned about the safety of vape pens?



  1. AQI Service

    December 17, 2019 at 4:41 pm

    For any hazardous materials, it has to be tested before production, we are third party quality control company, we suggest action as 1) Request the materials matches RoHs or FDA Requirements, 2) test the material before production, 3) During production, Draw samples from production line and send to labroatory to verify it. 4) set up the tracking system for the batch of materials

  2. Blaze

    May 28, 2019 at 7:42 am

    I know this is about Cannabis Vaping and i am a consumer and Health Canada registered medical patient in Canada.

    But i also use the JUUL so as not to smoke cigarettes and now smoking free for 2 years.

    What can someone add OR direct me to learn on Nicotine Vape devices such as JUUL and VYPE ?

  3. geoffrey magoon

    May 14, 2019 at 5:19 am

    I vaped before ,having a ct scan with radioactive juice on my lungs, ( i have lesions and nodules ) however i vaped 5 hits before going in,, My tonsil’s and adenoids, came up hot, biopsies later no cancer?? Next trip in tumor on my parotid gland come back hot ! Oh boy another needle biopsy no cancer again..

  4. Maxcatski

    April 16, 2019 at 7:12 am

    I have concerns not only above the pens but what is contained on the cartridges. Inhaling vegetable glycerin or propylene glycol is not good for the human body. No studies show this is safe. On top of that, the manufacturers add in terpenes from other sources. This is not pure cannabis that you are inhaling, folks. And no one really seems to know the correct temperatures to use in their vaporizer.; they are hitting way too hot. I gave my vaporizer away. Now i only smoke pure cannabis products, flower or dry sift hash. My lungs are clear and I feel great!

  5. Marvin Goodpickle

    March 3, 2019 at 5:05 pm

    Flori-duh legislators are still stalling positive legislation, trying to prevent patients being able to get the whole plant, or growing their own medicine, meanwhile exposing thousands to useless heavy metals. They need to be held accountable!

  6. Dave W

    March 3, 2019 at 10:51 am

    Thank you for writing this article!
    I’ve used both cartridge and disposables in the past with no problems. I prefer flower, but my apartment complex doesn’t allow. I didn’t want to get evicted. So I went to my local and trusted dispensary and bought a Roots cartridge crafted by TAPROOT and charged my Ooze battery. The battery was set to 4.3v. The first hit from this setup was very harsh. Didn’t think much of it at the time. I used this maybe four hits total. Now for the last two weeks I’ve been dealing with a metallic taste in my mouth. I’ve been to the doctor and dentist. They both can’t see anything wrong with my mouth. I’m now on my fourth different medicated mouth wash. I’ve stopped smoking everything! I haven’t smoked anything in the last four days. The metallic taste is slowly going away. I just want to get better and feel normal again. And, I’d really like to know want really caused this metallic taste in my mouth, some research says it could be from an inner ear infection? I’m open to any and all constructive comments.
    Thank you again!

    • MARY

      March 11, 2019 at 8:27 am

      I broke a filling once and that same taste followed me for a month till I refilled my filling… is it possible that you coughed to hard and did the same? I’ve smoked about 100 different tanks and well I’d be interested to know what happened to you…

  7. geoffrey magoon

    March 3, 2019 at 3:54 am

    i was in a county nursing home, i was allowed to have my medical cannabis only if no smell.. i felt lucky to have a cbd/thc hybrid 4 watt pen , and a salve of the same, please keep up the good work.. dr,s improperly titrated me off cymbalta, Flower is best..

  8. jeff

    March 2, 2019 at 9:58 am

    Thank you Cannabis Now for bringing this alarming story to the public. As someone who works with many medical cannabis patients, it is truly frightening to see how many dispensary bud tenders actually recommend vape pens as the safest way to consume cannabis… even without this heavy metal problem (which is horrifying), vaping/combusting oils with other additives such as questionably sourced terpenes and processing solvents is a serious health risk to everyone, especially fragile medical patients. NOTE: 3 out of 5 advertisements on this page/online article are for vape pens! Thank you Cannabis Now for covering this even though many of your advertisers may not be stoked…

  9. Cautionary Tale

    March 1, 2019 at 10:03 pm

    I switched to the pens for a few months and developed the worst cough and wheeze I’ve ever had. All carts from recognizable California brands, too. Back to flower for a couple weeks now and I’m mostly better.

    • John

      April 24, 2019 at 7:11 pm

      Me too! Just messed up my throat bad. I was using a cartridge a week and set my mod at the lowest possible setting (which was different for each cartridge?)
      We have not seen the problems yet with vaping, as the residual oils mixed with metal coils (which all degrade with heat and time) can produce all kinds of cats and dogs.
      I stopped smoking cigs. and tried vaping, but being in the Chemical Manufacturing industry could not get over the plethora of chemicals that are produced when you heat hydrocarbon products with various metals.
      Ya I know it was stupid to smoke in the first place, but I did quit….

  10. Hal on Wheels

    February 28, 2019 at 12:52 pm

    I’ve been a “vaper” for 2 years now, having been converted after 56 years of smoking by my brother who came to visit me. He never smoked tobacco a day in his life at 50 and didn’t like smoking pot either.
    We went to a dispensary where he bought a gram of Sour Diesel (and one of OG Kush for me) and I haven’t smoked much at all subsequently save for with my friend who visit my farm.

  11. ShishkaBerry

    February 28, 2019 at 3:47 am

    Hmm people have been vaping with nichrome in e-cigarettes for years with no issues, maybe they had a reaction to something else in the cartridge. Ofc, God only knows if it was actually nichrome or some random metal. I only use stainless steel 316L coils, they seem to be the safest and it’s a food grade steel.

  12. Teresa Donahue

    February 26, 2019 at 9:38 am

    My old wooden box vaporizor worked clean and simple.

  13. Charles Hurlow

    February 25, 2019 at 2:58 am

    Yes I I’m

  14. Dennis Hinze

    February 23, 2019 at 6:16 pm

    Burning oils produce complex hydrocarbons. Not good for lungs or circulatory system. ❤️

    • Hal B

      February 28, 2019 at 12:46 pm

      Key word, “burning” ~js

  15. Marigold

    February 20, 2019 at 5:58 pm

    I’m a medical patient in Minnesota and we have to use vape pens because they don’t have flower in the program. Only extracts. I hope their CCELLS are not this nickel stuff. :/
    Vaporizing flower in glass tabletop vapes is far superior.

  16. Lawrence Goodwin

    February 20, 2019 at 12:59 pm

    A very interesting story, Mitchell. Many thanks to you and Cannabis Now for covering this serious public matter.

    Due to that same uncertainty, I’ve been leery of vaporizers from the start. Stories like this make it abundantly clear that we need proper testing and safety regulation of these devices, and fast—the fact that states don’t have regulations in place yet is just one of countless problems caused by the ruthless federal “marihuana” prohibition. Mainstream media stories about batteries blowing up everywhere don’t allay such concerns, either.

    I just lost a good friend in his 50s, a heavy consumer of cannabis vapor, to a sudden respiratory problem. While I wonder if a poisoning by heavy metals was involved, I should probably refrain for a while bringing it up with his grieving lovely lady.

    • Daniel L Sawyer

      March 2, 2019 at 7:45 pm

      Ever since I started smoking the vape pens I’ve developed a bad cough so im switching back to the plant for awhile

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