Cannabinoid is a green or grey mixture of dried, shredded flowers and leaves of the hemp plant. The mixture is most commonly known as marijuana, and it affects the areas in the brain responsible for movement and memory. It is the most often used illegal drug in the United States. Marijuana in its smoked form has no commonly accepted medical use. However, the active chemical in marijuana is manufactured into a pill available by prescription. This prescription drug is used to treat the nausea and vomiting that occur with certain cancer treatments and to help AIDS patients eat more to keep up their weight.