Pick up a bag of chips. Federal law requires the ingredient list on the label, in legible type, in a specific format. Pick up a hemp vape cartridge. No equivalent mandate exists. Some brands list ingredients. Many don’t. A few list them in 6-point font on a box flap designed to be thrown away. What’s buried in that omission is what this article covers.
🧪 Lab Tested | 👩💼 Woman-Owned | 🏆 Est. 2017
What Should Be in Your Vape (Two Things)
A clean vape oil has exactly two ingredients. Cannabis extract (the cannabinoids) and terpenes, the aromatic compounds responsible for flavor and the strain-specific character of the experience. Phillip M.: “Organic and only 2 ingredients, cannabis and terps.”
That’s the whole list. Cannabis extract delivers the THCa, Delta-8 THC, CBD, HHC, or whichever cannabinoid you’re after. Terpenes deliver the flavor and contribute to the entourage effect. Nothing else is required. Anything beyond those two is either filler, a cost-cutting measure, or both. Gail C.: “Clean ingredients, excellent results what more can you ask?”
Brands have a financial incentive not to tell you what’s in the oil beyond the cannabinoid count. That’s why this guide exists.
What Gets Added, and Why
Cannabis extract is expensive. A full gram of genuine THCa live resin costs significantly more to produce than a gram of distillate padded with carrier oil. The math is simple: add 30% MCT oil and you’ve just increased your saleable volume by 30% while reducing your cannabis extract cost proportionally. The consumer pays the same price. The manufacturer pockets the difference.
Vitamin E Acetate
Also on labels as: tocopheryl acetate · tocopherol · vitamin E oil · tocophersolan
The worst one. Vitamin E Acetate is a thick, oily compound: safe to eat, safe to apply to skin, catastrophic to inhale. The CDC and FDA identified it as the primary culprit in the 2019 EVALI outbreak that killed 68 people and hospitalized nearly 3,000 more. A 2020 New England Journal of Medicine study found it in bronchoalveolar lavage fluid from 48 of 51 EVALI patients tested. The proposed mechanism: it interferes with normal lung surfactant function when inhaled as an aerosol.
It was predominantly found in illicit-market THC cartridges, but the economics that created it (cheap additive, high margin) exist in every unregulated market, including hemp. Its presence in any vape product, from any brand, is a disqualifier.
Blount, B.C. et al. (2020). “Vitamin E Acetate in Bronchoalveolar-Lavage Fluid Associated with EVALI.” New England Journal of Medicine, 382, 697-705. PubMed: 31860793.
MCT Oil (Medium Chain Triglycerides)
Also on labels as: fractionated coconut oil · caprylic acid · capric acid · C8/C10 oil
MCT oil is useful in tinctures, where it serves as a carrier that improves cannabinoid absorption through the digestive system. In a vape cartridge, it has no functional purpose for the consumer. Its purpose is for the manufacturer: it thins thick cannabis extract so cartridges fill more easily and each gram of actual extract goes further. A cartridge diluted 30% with MCT oil gives you roughly 700mg of cannabis extract where you paid for 1,000mg.
Research from Portland State University found that MCT and similar lipid-based additives produce aldehydes (including acrolein and formaldehyde) when heated to vaporization temperatures. These compounds are associated with respiratory inflammation. The oil doing useful work in your morning coffee is not doing useful work in your lungs.
Vegetable Glycerin (VG)
Also on labels as: glycerol · glycerin · E422 · plant-derived glycerin
VG is the base of most nicotine vape liquids, where it serves a real purpose: it’s the humectant that carries nicotine in aerosol form and produces the visible vapor cloud. In a cannabis vape cartridge, it does one thing: dilutes the oil. Cannabis extract doesn’t need a cloud-producing carrier; it vaporizes directly when heated. The visible vapor cloud VG creates may even be used as a selling point (“big clouds = strong product”), which is backwards. Bigger cloud from VG means more filler, not more cannabinoid.
Studies have documented that glycerin heated repeatedly to vaporization temperatures breaks down into acrolein, the same lung irritant found in cigarette smoke. The FDA’s GRAS designation for VG applies to food use only. It does not extend to inhalation.
Propylene Glycol (PG)
Also on labels as: propane-1,2-diol · 1,2-propanediol · E1520
PG is thinner than VG and often blended with it in nicotine vape liquids. In cannabis vapes it’s used as a diluent with no consumer benefit: it thins oil, increases volume, reduces extract cost per cartridge. Studies have found inhaled PG aerosol can irritate respiratory mucous membranes, and that PG breaks down at high temperatures into propylene oxide, a recognized carcinogen. Like VG, its FDA GRAS status covers food use, not inhalation.
Polyethylene Glycol (PEG)
Also on labels as: PEG-400 · polyethylene oxide · macrogol
PEG-400 is a synthetic polymer used as a solubilizer in pharmaceutical and cosmetic manufacturing. In cannabis vapes it’s used to thin highly viscous concentrates. A 2017 study in the Journal of Alternative and Complementary Medicine found that PEG-containing cannabis oil produced detectable formaldehyde above 200°C, temperatures readily reached in variable-voltage batteries at higher settings. It has no nutritional or therapeutic function in a vape cartridge.
Troutt, W.D. & DiDonato, M.D. (2017). “Carbonyl Compounds Produced by Vaporizing Cannabis Oil Thinning Agents.” Journal of Alternative and Complementary Medicine, 23(11), 879-884. PubMed: 28678531.
The Label Decoder: What These Additives Are Called
Brands that use cutting agents rarely label them “MCT oil” or “vegetable glycerin.” They use technical names, IUPAC nomenclature, or vague descriptions. Here’s the cheat sheet.
| If you see this on the label… | It means… | Verdict |
| Tocopheryl acetate | Vitamin E Acetate | Do not buy |
| Fractionated coconut oil, caprylic acid, capric acid, C8, C10, C8/C10 | MCT oil | Diluted. Avoid. |
| Glycerol, glycerin, E422, plant-derived glycerin | Vegetable glycerin | Diluted. Avoid. |
| Propane-1,2-diol, 1,2-propanediol, E1520 | Propylene glycol (PG) | Diluted. Avoid. |
| PEG-400, polyethylene oxide, macrogol | Polyethylene glycol | Diluted. Avoid. |
| Hemp extract, cannabis extract, CO2 extract | Cannabis extract ✓ | Good |
| Cannabis-derived terpenes, strain-specific terpenes | Terpenes from actual cannabis plants | Good |
| Natural terpenes, botanical terpenes, natural flavors | Terpenes sourced from non-cannabis plants (legal, but less strain-accurate) | Acceptable (not ideal) |
The most common trick: listing ingredients in small print on the outer box (which gets thrown away) rather than on the cartridge itself (which stays in your pocket for weeks). A cartridge with nothing but a strain name and milligram count on the unit has given you no ingredient information at all. That absence is a choice.
How to Catch Them Before You Buy
Three checkpoints, in order of reliability.
Check the COA’s residual solvents panel
The certificate of analysis is the closest thing to an actual ingredient list. The residual solvents panel is designed to confirm extraction solvents were purged; it also reveals certain adulterants. Ethanol, butane, propane, hexane: these indicate extraction method and processing quality. For Vitamin E Acetate specifically, ask for a separate tocopheryl acetate test; standard panels don’t always include it. A full-panel COA with clean residual solvents is not a guarantee the oil is additive-free, but a COA with no residual solvents panel, or a brand that doesn’t publish COAs at all, is a significant red flag.
Check the ingredient list on the label or box
If an ingredient list exists, run every unfamiliar term through the decoder table above. Look specifically for any of the five additives listed. If the “ingredient list” is just “cannabis extract, natural flavors” with no terpene specifics, you don’t know whether those flavors are cannabis-derived terpenes or botanical stand-ins.
What a clean vape COA must show
- Cannabinoid potency panel: confirms labeled milligram count. Verify the primary cannabinoid is at or above label.
- Residual solvents: non-detected across all compounds. This is the most critical panel for any inhaled product.
- Pesticide screen: 50+ compounds, all non-detected. Cannabis concentrates amplify what’s in the source plant.
- Heavy metals: lead, arsenic, mercury, cadmium below established limits. Can originate in soil or from cartridge hardware.
- Terpene panel (for live resin): multiple terpenes at meaningful percentages. A live resin claim with a sparse terpene panel is a flag.
- Batch-specific lot number matching your order. An undated or generic COA tells you nothing about the batch you received.
The viscosity test
Flip the cartridge upside down. Genuine cannabis extract is thick; it moves slowly, if at all, at room temperature. Oil that flows freely and quickly has been thinned. Not a definitive test, but a clean cartridge from a high-quality extraction should behave like molasses, not like water. If it runs fast, something made it runnier than the extract would be on its own.
alexis g.: “the taste is natural, not synthetic flavouring, and I appreciate that.” Edward E.: “Love that the ingredients are lab tested and assured quality and clean.”
What’s in TribeTokes Vapes
Cannabis extract and terpenes. The complete ingredient list. No MCT oil, no vegetable glycerin, no propylene glycol, no polyethylene glycol, no Vitamin E Acetate. For live resin products, the terpenes are preserved from fresh-frozen source plant material during extraction; they weren’t stripped out and replaced with a botanical approximation.
Every batch ships with a full-panel COA covering cannabinoid potency, residual solvents, pesticides, heavy metals, and terpene content for live resin products. COAs are batch-specific and from ISO 17025-accredited labs. All COAs are published at tribetokes.com/certificates-of-analysis.
Carolyn K.: “Cleanest taste and ingredients available. Don’t hesitate, just do it.” Bert L.: “Everything from the packaging, presentation, and even has the testing information on the box. Premium carts with attention to detail.”
Shop the full vape lineup at tribetokes.com/all-vape-cartridges. Woman-owned since 2017.
Frequently Asked Questions
The five to watch for: Vitamin E Acetate (tocopheryl acetate on labels), MCT oil (fractionated coconut oil, caprylic acid, capric acid), vegetable glycerin (VG, glycerol, E422), propylene glycol (PG, E1520), and polyethylene glycol (PEG-400). Vitamin E Acetate was identified as the primary culprit in the 2019 EVALI outbreak that killed 68 people. The others are diluents: they increase sellable volume by padding expensive cannabis extract with cheaper filler, and produce harmful compounds when heated to vaporization temperatures.
Economics. Vitamin E Acetate is a cheap, thick, oily compound that blends easily with cannabis extract to increase volume without affecting the oil’s appearance or smell. It was used extensively in illicit-market THC cartridges to stretch product. The CDC linked it to the 2019 EVALI outbreak: it was found in bronchoalveolar lavage fluid from 48 of 51 EVALI patients tested. When inhaled as an aerosol, it appears to interfere with normal lung surfactant function. It has no benefit to the consumer and no legitimate purpose in any vape product.
MCT oil thins thick cannabis extract so cartridges fill more easily and manufacturers use less actual extract per unit. It has no benefit to the consumer. Research has found that MCT and similar lipid-based carriers generate aldehydes (including acrolein and formaldehyde) when heated to vaporization temperatures. These compounds are associated with respiratory inflammation. MCT oil is genuinely useful in tinctures (it improves cannabinoid absorption through the digestive system). That doesn’t make it safe to inhale.
No. Hemp vape cartridges are not subject to mandatory federal ingredient labeling requirements equivalent to those for food or drugs. The FDA has issued guidance on hemp products generally but hasn’t established specific disclosure mandates for hemp vapes. State requirements vary. Ingredient transparency is voluntary, which means a brand choosing not to disclose is making an active decision, not just an administrative oversight.
Check three things. First, the ingredient list: look for MCT oil (fractionated coconut oil, caprylic acid), VG (glycerol, glycerin), PG (propane-1,2-diol), or PEG (PEG-400): all signal diluted oil. Second, the COA residual solvents panel: should show non-detected across all compounds; a missing residual solvents panel is itself a red flag. Third, the physical viscosity test: flip the cartridge upside down; genuine cannabis extract is thick and moves slowly; thinned oil flows freely. No single test is definitive, but all three pointing clean is a strong signal.
It has documented risks at vaporization temperatures. Studies have found that VG heated repeatedly breaks down into acrolein, a lung irritant also found in cigarette smoke. The FDA’s GRAS designation for VG applies to food use; it doesn’t cover inhalation. In cannabis vapes specifically, VG serves no consumer purpose; its role is as a diluent. In nicotine vapes it serves as the aerosol carrier (which is its intended function in that format). In a cannabis cartridge, it’s padding.
Two ingredients: cannabis extract and terpenes. The extract delivers the cannabinoids (THCa, Delta-8 THC, CBD, HHC, or whichever is labeled). The terpenes provide the flavor profile and contribute to the entourage effect between cannabinoids and aromatic compounds. Nothing else is required. A clean vape oil requires no carriers, no thinners, and no humectants. If the ingredient list contains anything beyond cannabis extract and terpenes, the oil has been diluted.
A complete COA covers: cannabinoid potency (confirms labeled milligram count), residual solvents (non-detected across all compounds, the most critical panel for an inhaled product), pesticide screen (50+ compounds, all non-detected), heavy metals (lead, arsenic, mercury, cadmium below limits), and for live resin products, a terpene panel showing multiple terpenes at meaningful percentages. The COA should be batch-specific with a lot number matching your order, and from an ISO 17025-accredited lab. A potency-only COA is not adequate for a vape product.
Two Ingredients. Full Transparency.
Cannabis extract and terpenes. No MCT, no VG, no Vitamin E Acetate. Full-panel COAs before every batch ships. Woman-owned since 2017.
Sources
- Blount, B.C. et al. (2020). “Vitamin E Acetate in Bronchoalveolar-Lavage Fluid Associated with EVALI.” New England Journal of Medicine, 382, 697-705. PubMed: 31860793.
- Troutt, W.D. & DiDonato, M.D. (2017). “Carbonyl Compounds Produced by Vaporizing Cannabis Oil Thinning Agents.” Journal of Alternative and Complementary Medicine, 23(11), 879-884. PubMed: 28678531.
- CDC. (2020). “Outbreak of Lung Injury Associated with the Use of E-Cigarette, or Vaping, Products.” Centers for Disease Control and Prevention. cdc.gov.