In drug slang, a “cart” is a small, pre-filled vape cartridge containing concentrated cannabis oil or another substance designed to be inhaled as vapor. The cartridge attaches to a battery-powered pen, which heats the oil and turns it into an aerosol you breathe in. Carts have become one of the most popular ways to consume cannabis concentrates, largely because they’re discreet, portable, and significantly more potent than smoking flower.
What’s Inside a Cart
A standard cart has four basic parts: a mouthpiece at the top, a small transparent tank holding the oil, an atomizer with a heating coil that vaporizes the liquid, and threaded connectors at the bottom that screw onto the battery. Most carts use a universal “510-thread” connection, meaning they fit a wide range of battery pens sold separately. The tank is typically glass or clear plastic so you can see how much oil remains.
The oil inside is almost always a cannabis concentrate, though the type varies. The three most common are distillate, live resin, and rosin. Each offers a noticeably different experience.
Distillate, Live Resin, and Rosin
Distillate is the most widely sold cart fill. It’s a highly refined oil that isolates THC (or sometimes CBD) from the rest of the plant material, producing concentrations often above 90% THC. That potency comes at a cost: most of the natural flavor compounds are stripped away during processing, so manufacturers add terpenes or fruit-derived flavoring back in. Distillate carts are popular because they’re consistent, smooth, and typically the cheapest option.
Live resin is made from cannabis plants that were flash-frozen immediately after harvest rather than dried. Freezing preserves the plant’s full range of terpenes and minor cannabinoids, which gives live resin a richer, more complex flavor and aroma. The extraction uses chemical solvents like butane, which are then purged from the final product. Live resin carts generally cost more than distillate but deliver what many users describe as a more well-rounded effect.
Rosin takes a completely different approach. It’s extracted using only heat and pressure, with no solvents at all. This makes it the “cleanest” option in terms of processing, and rosin carts tend to retain the most authentic flavor of the original strain. They’re also the most expensive.
How Potent Carts Actually Are
This is where carts differ most dramatically from traditional cannabis. Cannabis flower today averages around 21% THC, with particularly strong strains reaching 35%. Concentrates used in carts range from 60% to 90% THC. In 2022, the average THC concentration for concentrates sold in Washington state was 69%, more than three times the average for flower. That potency gap means a single puff from a cart delivers far more THC than a comparable puff from a joint or bowl, which catches some users off guard.
Voltage and How It Affects the Experience
The battery you attach a cart to lets you adjust the voltage, which controls how hot the coil gets. This directly changes the flavor, vapor density, and even the chemical composition of what you inhale. For live resin carts, the recommended range is 2.5 to 3.3 volts. At the low end, you get lighter, more flavorful vapor because the terpenes aren’t being burned off. At the high end, vapor becomes denser but flavor quality drops. Setting the voltage too high destroys terpenes and cannabinoids, producing a harsh, less effective hit. Higher settings also drain the battery faster.
Health Risks From Black Market Carts
The most serious health risks associated with carts come from unregulated, counterfeit products. In 2019, a wave of severe lung injuries swept across the United States in what the CDC labeled EVALI (e-cigarette or vaping use-associated lung injury). Researchers at the New England Journal of Medicine found vitamin E acetate in the lung fluid of 48 out of 51 patients tested, and it was not found in any healthy comparison subjects. Vitamin E acetate is an oily thickening agent that black market producers add to diluted cart oil because it mimics the viscosity of legitimate products at a fraction of the cost.
Heavy metals are another concern, even in some legal products. The heating coils and metal components of cartridges can leach lead, nickel, chromium, copper, and cadmium into the oil and aerosol. A scoping review published in The Scientific World Journal found that illegal cart samples contained lead and nickel at levels exceeding regulatory tolerance limits by 100 and 900 times, respectively. Some states, including California and Colorado, now require testing for these metals in licensed cannabis products, but enforcement varies.
How to Spot a Fake Cart
Counterfeit carts are widespread, and using one means inhaling an unknown mixture of chemicals. There are several practical ways to evaluate what you’re looking at:
- Packaging details: Legal carts are required to display a batch number, manufacturing date, lot number, and package date. Missing any of these is a red flag.
- License and lab results: A legitimate cart will have a license number on the packaging and publicly accessible lab results, often linked through a QR code. Scan it. If the serial number on the package doesn’t match the one in the QR code, the product is counterfeit.
- Oil color: Authentic cannabis oil is typically golden or light amber and relatively clear. Oil that looks dark brown or unusually orange likely contains excessive additives.
- Price: If a cart costs significantly less than comparable products at licensed retailers, something has been cut or substituted to reduce production costs.
- Stated potency: Carts advertising CBD or THC percentages below 60% for a concentrate product may be diluted with unknown fillers.
Symptoms that suggest a cart may contain harmful contaminants include difficulty breathing, throat and eye irritation, chest tightness, dizziness, and unusual fatigue. These overlap with the early warning signs identified during the EVALI outbreak.
Beyond Cannabis
While the vast majority of “carts” in drug-related conversation refer to cannabis oil cartridges, the same hardware is occasionally used with other substances. Nicotine vape cartridges use similar technology but are a separate product category. In rarer cases, cartridges have been filled with DMT or synthetic cannabinoids, though these are almost exclusively found on the black market and carry additional, unpredictable risks due to the complete absence of quality control or dosing standards.