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Cannabis joint. Hand holding a lit cannabis joint, surrounded by leaves of the cannabis plant (Cannabis sativa). The leaves and flowering tops of this plant are dried to make the psychoactive drug marijuana. This drug is usually smoked for feelings of mental relaxation, a perception of slowed time and a heightening of the senses. Cannabis has medicinal uses, but is banned in most countries. (KEYSTONE/SCIENCE PHOTO LIBRARY/CRISTINA PEDRAZZINI)