CBD vape cartridges: what to check first

What a cartridge is

A small glass or plastic tank, prefilled and sealed, with a coil inside and a threaded base that screws onto a battery. Most use the 510 thread, which is a physical standard and nothing more: it guarantees the cartridge will fit, and says nothing about what is in it or how hot the battery will run it.

The thickening agent problem

In 2019 hospitals across the United States saw a wave of severe lung injury in people who vaped. The investigation identified vitamin E acetate, used as a thickening agent in illicit THC cartridges, in the lung fluid of the great majority of sampled cases, and named it the primary cause.

What the thread number does not say

510 is a thread size. It means a cartridge will screw onto a battery, and it carries no implication about what is inside either one: not the extract, not the coil material, not the temperature the battery will run it at.

Reading it as a compatibility standard is correct. Reading it as a quality mark, which the packaging often encourages, is not.

What else has been found in them

Forensic analysis of commercially available CBD e-liquids reported, in Forensic Science International, the synthetic cannabinoid 5F-ADB and, separately, dextromethorphan — neither declared on the label. A 2017 JAMA analysis of 84 CBD extracts found around seven in ten inaccurately labelled.

Neither finding says the category is uniformly bad. Both say the label alone is not evidence, and that the only document standing between a buyer and those findings is a batch certificate.

What the certificate has to cover

• Cannabinoids, with a THC figure as a number rather than the phrase "THC free".
• Residual solvents, left by extraction.
• Heavy metals, which can migrate from hardware as well as from the plant.
• Pesticides.
• A batch code and a date that match the cartridge in your hand.

Reading the numbers on the box

A cartridge stating 200 mg in a 1 ml tank is 200 mg per millilitre, and typically somewhere between one and two milligrams a puff. That is the only arithmetic worth doing, and it is enough to show that a cartridge is a small number of milligrams spread thin rather than a large dose.

There is no established inhaled dose of CBD for any over-the-counter purpose, so the number is for comparing products with each other rather than for hitting a target.

What a cartridge actually holds

The two numbers on a box are the fill volume and the cannabinoid total, and together they are the only comparison between two cartridges.

• A 1 ml cartridge stating 200 mg is 200 mg per millilitre.
• A 0.5 ml cartridge stating 200 mg is twice that concentration in half the liquid, and will not last as long.
• Puffs are not a unit, but a millilitre is somewhere around a hundred to two hundred of them, which puts a typical puff at one to two milligrams.

Neither number tells you what arrives in your blood, which depends on the device, the draw and how much vapour you exhale again. They are for comparing cartridges with each other.

Why cartridges clog, and what to do

Most cartridge complaints are physics rather than quality. Thick extract in a cold room will not feed a coil; a cartridge left in the sun floods one.

Spectrum, and why it matters more here

Full spectrum carries a trace of THC by design; broad spectrum removes it; isolate is CBD alone. On an inhaled product the trace matters twice over: it is the ingredient with an established effect on heart rate and eyes, and it is the one that a drug test looks for.

The battery is your half of it

A cartridge has no settings. Everything about how hot it runs is decided by the battery screwed onto it, which is why the same cartridge can be pleasant on one device and harsh on another.

Start at the lowest setting that produces vapour and go up only if nothing comes out. The cannabinoid is the same at every voltage; the by-products are not.

Prefilled or refillable

The trade is straightforward. A prefilled cartridge is sealed, which is convenient and means you are trusting a label on a category with a poor labelling record. A refillable tank lets you buy a bottle whose batch certificate you have read, and costs you coils and cleaning.

On a shelf where around seven in ten extracts were found inaccurately labelled, being able to choose the bottle is not a small advantage.

Storage, and what spoils a cartridge

• Upright and cool. Heat thins the extract and can flood the coil; cold thickens it and starves one.
• Out of the light. Cannabinoids degrade with ultraviolet exposure.
• Not in a hot car, which is both of the above at once.
• Not indefinitely. Terpenes evaporate and flavour flattens well before the cartridge is empty.

Why this page names no products

It used to list eight. Four of the eight linked to a brand other than the one the card named, because the legacy page carried stale affiliate links under headings that had been rewritten since. Shipping those would have meant sending readers to a product we had not named.

The checks above outlast any particular cartridge, and a shop that publishes a full certificate per batch is doing the thing that actually separates this category.