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Marijuana is the most commonly used illicit drug in the nation. It is considered a Schedule I drug in the United States which means it is illegal under federal law, although some states have legalized its use. Marijuana is also called pot, weed, herb, grass, bud, Mary Jane, ganja, and many other slang terms. It is a greenish-gray mixture of the dried flowers of the plant Cannabis sativa. Delta-9-tetrahydrocannabinol (THC) is the main psychoactive chemical found in marijuana that produces intoxicating effects that people seek. Marijuana can be smoked in hand-rolled cigarettes (joint), in pipes, water pipes (bongs), or in blunts (rolled in cigar wraps).  Marijuana can also be consumed when mixed with foods such as brownies or cookies (edibles).