What is It?
Marijuana is a green, brown, or gray mixture of dried, shredded leaves, stems, seeds, and flowers of the hemp plant. Marijuana has a chemical in it called tetrahydrocannabinol, better known as THC. All forms of marijuana are mind-altering (psychoactive). In other words, they change how the brain works. A lot of other chemicals are found in marijuana, too — about 400 of them, some of which are carcinogenic. Marijuana is addictive with more teens in treatment with a primary diagnosis of marijuana dependence than for all other illicit drugs combined.