Check the license first
US cannabis rules come from the state, not from a national regulator. A store or delivery service that sells THC carts needs a state license. Ask for the license number. Legal states such as California, Colorado, Washington, Michigan, and Massachusetts publish those numbers in a state database. A seller who will not share one is not a licensed seller.
Federal law lists cannabis as a Schedule I substance. That fact does not block sales in states with legal markets, but it does mean the FDA does not review state-legal vape carts. The FDA has approved one cannabis-derived drug, Epidiolex, for two rare seizure conditions.
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Know the oil type
Four types fill most cartridges.
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- Distillate: THC level 80% to 95%. Terpenes get added after extraction. Flavor comes from those added terpenes.
- Live resin: extract from plants frozen at harvest. THC level 60% to 80%. More of the plant's own terpenes stay in the oil.
- Cured resin: dried plant material, not frozen. THC level 60% to 80%.
- Rosin: heat and pressure, no solvent. THC level 50% to 75%.
Terpenes come from cannabis or from other plants. A label that says cannabis-derived terpenes names the source. A label that says botanical terpenes or food-grade terpenes does not.
Hardware parameters
- Thread. 510-thread carts fit most batteries. Pod systems fit one brand.
- Tank size. 0.5 mL and 1 mL are standard. A 1 mL cart at 85% THC holds about 850 mg of THC.
- Voltage. 2.5 V to 3.8 V covers most oils. Output above 4.0 V burns terpenes and shortens coil life.
- Coil. Ceramic holds heat and suits thick oil. Cotton wicks thin oil.
- Inlet holes. Small holes suit thick resin. Large holes flood with thin distillate.
Ask these four questions
- What is the batch number and the test date?
- Can I see the lab report for pesticides, residual solvents, heavy metals, and microbials?
- Are the terpenes cannabis-derived or botanical?
- Does the oil contain a cutting agent or filler?
State labs test for those four contaminant groups in most legal markets. A licensed shop keeps batch reports on hand.
Pitfalls
- Counterfeit packaging. Copies of large brands show up in unlicensed shops and on delivery lists.
- Gift models. Some delivery services sell a shirt or a snack and give the cart as a gift. No state license covers that, and the cart has no test record.
- Price that is too low. In 2024, licensed 1 mL carts ran about $25 to $60 in most legal states. A $12 cart points to an unlicensed supply chain.
- No batch number. Without one, you cannot match the cart to a lab report.
- Vague labels. A proprietary blend is not an ingredient list.
Health risk to know
CDC tied vitamin E acetate to the 2019 EVALI outbreak. As of February 18, 2020, states had reported 2,807 hospitalizations and 68 deaths. Most patients used THC vape products from informal sources. Symptoms include shortness of breath, chest pain, and cough. Seek medical care for those symptoms.