Marijuana refers to the dried leaves, flowers, stems, and seeds from the hemp plant, Cannabis sativa. The plant contains the mind-altering chemical delta-9-tetrahydrocannabinol (THC) and other related compounds. Extracts can also be made from the cannabis plant. Read the DrugFacts.

Common Names

Weed, Herb, Pot, Grass, Bud, Ganja, Mary Jane

35.7% of high school seniors used marijuana in the past year.

Source: 2019 Monitoring the Future Survey

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Clinical trials are research studies in human volunteers conducted to answer specific health questions. Learn about the NIH-sponsored clinical trials available to you.