Pamphlet Intro: Marijuana is the most commonly used illegal drug in the United States. Also known as weed, pot, grass, and Mary Jane, marijuana consists of various parts of the hemp plant known as Cannabis sativa . Within the hemp plant is a mind-altering chemical known as THC. It can be smoked, inhaled with a vaporizer, or mixed into foods or liquids. Mostly used recreationally, marijuana is known to induce a relaxed state.