History
Unlike nicotine and alcohol, which have been part of the American
landscape since colonial times, marijuana is a far more recent arrival.
Derived from the plant cannabis sativa, marijuana is native to central
Asia. Anthropologists and historians have traced its spread throughout the world. It was known in China as early as 3000 b.c.e. The conventional wisdom is that it was never widely used for its psychoactive
effects, and it was considered an inferior medicine. The response in
India, a millennium later, was more enthusiastic. Cannabis was adopted
both as a sacred plant
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