Still, THC isn't the only chemical that swings into action when pot does its stuff. What THC and the other cannabinoids do is temporarily tilt the balance of chemicals in the brain involved in thought, feeling, and memory. Other effects may last longer. All kinds of effects. Pot subtly alters sensory perception.
Effects can include feelings of heightened sensitivity and a distorted sense of the passage of time.
M ental Changes. Marijuana can impair judgment and reasoning skills, particularly those involved in counting and the ability to follow complex instructions. It also temporarily disrupts short-term memory. Not in the sense of forgetting their own name-although they might have a problem with yours, if you were just introduced. That's because THC loves to tinker with short-term memory.