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'''Marijuana''' (colloquially known as '''"weed"''' or '''"pot"''') is the name given to the flowering buds of the cannabis sativa plant prepared for human consumption. The main active ingredient in marijuana is [[Tetrahydrocannabinol|THC]], or delta-9-tetrahydrocannabinol, an [[organic chemistry|organic chemical]] compound. Marijuana is harmful and generally illegal to possess, cultivate and sell in most countries, although it is legal in a few liberal jurisdictions if prescribed as medication by a physician.<ref>The sale of marijuana is illegal virtually everywhere in the world, and results in long prison sentences in many places. In Portugal, Argentina, California and South Australia, the use (rather than the sale) of small quantities of marijuana is allowed. In only one country in the world, the Netherlands, the sale of marijuana in small quantities is reportedly allowed by law enforcement.</ref>