GEORGE POST / SCIENCE PHOTO LIBRARY GEORGE POST / SCIENCE PHOTO LIBRARY
Marijuana for medical use. Seen here are a marijuana biscuit (upper left), a bag of buds (lower right) and three joints. Marijuana is the dried flowering heads of the hemp plant Cannabis sativa. It contains the psychoactive chemical tetrahydrocannabinol, which produces feelings of relaxation. These samples are from California, USA, where marijuana was legalised for medical use in 1996. It is an illegal drug in most countries.
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