THC, short for delta-9-tetrahydrocannabinol, is the main psychoactive compound in cannabis – the one responsible for the “high.”
How it works
THC binds to CB1 receptors in the brain and nervous system, part of the body’s endocannabinoid system. That is what produces its effects: euphoria, relaxation, altered perception of time, increased appetite and, for some people, anxiety or paranoia.
Potency
Product labels list THC as a percentage for flower and concentrates, or in milligrams for edibles. Flower today is far stronger than it was a few decades ago, and concentrates can be much stronger again. Higher numbers do not always mean a better experience.
How long it lasts
When smoked or vaped, effects come on within minutes and fade over a few hours. Edibles take much longer to kick in – often 30 minutes to two hours – and last longer, which is why people new to edibles are often caught off guard.
THC vs. CBD
Both come from the cannabis plant, but CBD does not produce a high. See What Is CBD?
Never drive after using THC. It can show up on drug tests for days to weeks after use.