THC

"The major active principle in all Cannabis products is Delta 9-Tetrahydrocannabinol (THC). THC is found in the Cannabis Plant. THC binds to specific receptors in the brain called Cannabinoid receptors. THC causes some pain reduction, may reduce aggression, can stimulate appetite and help reduce nausea".

The effects of THC are included among the effects of Cannabis, but not all the effects of Cannabis are necessarily due to THC.