The short answer

A disposable vape's THC content shows up two ways: a percentage on the oil and a total milligram count for the whole device. The percentage tells you how concentrated the oil is. The milligrams tell you how much THC you actually bought. A 1-gram disposable at 85% THC holds roughly 850 mg of THC. A 0.5-gram at the same percentage holds about 425 mg. That second number matters more, because it decides how long the device lasts and how much you take in per session.

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Percentage vs. milligrams

Potency percentages are THC by weight of the oil. Distillate, the clear stuff in most budget disposables, typically tests between 80% and 95%. Live resin and cured resin usually land in the 60% to 80% range. Live rosin tends to run 50% to 75%. The rest of the oil is not filler: it is terpenes, minor cannabinoids like CBD and CBG, and whatever carrier the producer uses.

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The math is simple. Grams times 1,000 times percentage equals milligrams of THC.

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How much THC is in one puff

Nobody draws the same way twice, but you can get close. A 1 g device at 85% with a claimed 300 puffs works out to about 2 to 3 mg of THC per draw. Long, hot pulls push that higher and burn through the oil faster, so real puff counts usually come in under the number on the box. Compare that to a 10 mg edible and it sounds small, but inhaled THC reaches your bloodstream in minutes. One draw, then wait 10 to 15 minutes before the next one.

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Why labels are not always exact

In licensed states, products go to accredited labs and the label has to match the batch. Independent testing has still found plenty of mismatch between stated and actual potency, usually with real THC running above or below the printed figure. Outside dispensaries the rules thin out fast. Hemp-derived disposables sold at gas stations follow a different rulebook: federal law caps delta-9 THC at 0.3% on a dry weight basis, which says almost nothing about how much THC ends up in the vapor. Those products often skip potency testing entirely.

What I check before buying

Potency and tolerance

High-potency vapes raise tolerance faster than flower, mostly because it is easy to hit one more time without thinking about it. If a 1 g 90% cart is lasting you a week, that is somewhere near 120 mg of THC a day. Worth knowing, even if you never plan to change anything. The label gives you the number. What you do with it is up to you.