Vape carts

Most cartridges are filled with distillate, which is cannabis extract that has been stripped down to a high-purity cannabinoid fraction by short-path or wiped-film distillation. Distillate is close to odourless and tasteless by design, often reported in the high eighties to mid nineties percent cannabinoid content, and it is chemically far removed from the plant it started as.

Live resin and live rosin cartridges are different products. These are filled with extract made from fresh frozen material that retains much of its original volatile content, so nothing has to be added back. Rosin carts in particular are solventless throughout. They are more expensive and more variable in viscosity, and the terminology is used loosely enough on packaging that the certificate of analysis is worth more than the front label.

There is also a large category of cartridges filled with converted cannabinoids such as delta-8 or HHC. Those carry the additional uncertainty of an unlisted byproduct profile from the conversion reaction, on top of everything else discussed here.

Guide: converted cannabinoids

Distillation removes everything except the target cannabinoids, terpenes included. A distillate cart with no additions would have essentially no flavour, so terpenes are blended back in, usually at a small percentage of the total volume.

Those terpenes come from one of two places. Cannabis-derived terpenes are recovered from cannabis material, often captured during extraction. Botanical terpenes are the same individual molecules sourced from other plants, which is chemically legitimate, since limonene is limonene regardless of whether it came from a cannabis flower or a citrus peel, but it means the blend is a formulation rather than a profile.

This is the honest reason a cart tasting of a named cultivar tells you very little about the genetics in it. The flavour was assembled. Strain names on distillate cartridges are frequently descriptions of the terpene blend, not statements about the source material.

Distillate is thick, so historically it was thinned with additives to make it flow through a wick. Propylene glycol, vegetable glycerin, polyethylene glycol and medium-chain triglyceride oil have all been used for this.

In 2019 a wave of severe lung injury cases in the United States, given the name EVALI, was traced by public health investigators overwhelmingly to illicit-market THC vaping products, with vitamin E acetate identified as a chemical of concern strongly associated with cases. Vitamin E acetate had been used as a thickener because it visually resembles good-quality distillate. The regulatory response was to mandate testing for it and to push the licensed market away from cutting agents in general.

The practical position today is that reputable licensed products are usually uncut, or thinned only with recovered terpenes. The risk did not disappear; it concentrated in the unregulated market, where nothing is tested and packaging is trivially counterfeited. A cartridge with no verifiable lab report is an unknown, and that was the actual lesson of 2019.

NoteThis is public health and regulatory history, recorded here because it explains current testing requirements. It is not health advice, and nothing here should be read as a safety claim about any product.

The cartridge itself is not neutral. It determines how the oil is heated and what else ends up in the vapour.

• —Heating element. Ceramic cores are now standard in the licensed market; older cotton-wick designs are associated with more inconsistent heating and a burnt taste as the wick dries out.
• —Intake aperture. The holes that let oil reach the element have to match the viscosity of the fill. Too small for a thick rosin fill and the cart starves and burns; too large for a thin fill and it leaks.
• —Voltage. Higher voltage produces bigger visible clouds by heating the oil harder, which also degrades terpenes and increases thermal breakdown products. Lower settings taste better and are the more conservative choice.
• —Materials. Metal components in contact with hot oil are a plausible route for heavy metal migration, which is exactly why licensed testing includes a heavy metals panel on the finished filled cartridge rather than on the oil alone.
• —Storage. Keep cartridges upright, cool and out of light. Heat thins the oil and encourages leaking; light degrades cannabinoids as it does everywhere else.

A useful certificate names the laboratory, carries a sample identifier that matches the batch on the package, and shows a date. A PDF with no traceable batch number is decoration.

The panels worth looking for are cannabinoid potency, terpene content if the product claims any, residual solvents, pesticides, heavy metals, and in jurisdictions that require it, vitamin E acetate specifically. A report that shows potency alone is not a safety document.

There are real limits to what any certificate establishes. It describes one sample from one batch at one point in time, it says nothing about the hardware unless the test was run on the filled cartridge, and it cannot tell you whether the package in your hand is the batch on the report. In an unregulated setting, all three of those gaps are routinely exploited.

This database does not catalogue cartridges or any other finished product. It records what breeders published about the genetics they bred.

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