Tetrahydrocannabinol, or THC, is the psychoactive cannabinoid in cannabis that affects the mind in several ways. THC makes users feel "high".
THC compounds attach to cannabinoid receptors throughout the brain and central nervous system. As a result, THC induces several psychoactive effects in the brain and throughout the human body.
Some of the psychoactive effects of THC include relaxation, drowsiness, hunger, decreased motor coordination, anxiety, as well as an increase in energy. THC is also known to help alleviate some of the adverse side effects of chemotherapy. These effects vary on an individual basis.