GEORGE POST / SCIENCE PHOTO LIBRARY GEORGE POST / SCIENCE PHOTO LIBRARY
Cannabis cake for medical use. This has been made from the resin from the hemp plant Cannabis sativa. It contains the psychoactive chemical tetrahydrocannabinol, which produces feelings of relaxation. These samples are from California, USA, where cannabis was legalised for medical use in 1996. It is an illegal drug in most countries.
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