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[[Image:Marijuana.jpg|thumb|250px|right|Indoor Marijuana Grow (DEA photo)]]

[[Image:Marijuana.jpg|thumb|250px|right|Indoor Marijuana Grow (DEA photo)]]

'''Marijuana''' (colloquially known as "weed" or "pot" or "dope" or "reefer") is the name given to the flowering buds of the ''Cannabis'' genus of plant, divided into the species ''Sativa, Indica'' and ''Ruderalis'', prepared for human consumption. The main psychoactive ingredient in marijuana is [[tetrahydrocannabinol|THC]], or delta-9-tetrahydrocannabinol, an [[organic chemistry|organic chemical]] compound which imitates natural cannabinoids produced in the human body.  Because THC is considered harmful, marijuana is generally illegal to possess, cultivate and sell in most countries, although it is legal in some [[liberal]] states.<ref>The sale of marijuana is illegal virtually everywhere in the world (other than Uruguay, and as of mid-2018 Canada), 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.</ref> In some extremely liberal jurisdictions, you can even buy it in a vending machine.<ref>E.g. [[Seattle]]</ref>

'''Marijuana''' (colloquially known as "weed" or "pot" or "dope" or "reefer") is the name given to the flowering buds of the ''Cannabis'' genus of plant, divided into the species ''Sativa, Indica'' and ''Ruderalis'', prepared for human consumption. The main psychoactive ingredient in marijuana is [[tetrahydrocannabinol|THC]], or delta-9-tetrahydrocannabinol, an [[organic chemistry|organic chemical]] compound which imitates natural cannabinoids produced in the human body.  Because THC is considered harmful, marijuana is generally illegal to possess, cultivate and sell in most countries, although it is legal in some [[liberal]] states.<ref>The sale of marijuana is illegal virtually everywhere in the world (other than Uruguay, and as of mid-2018 Canada), 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.</ref> In some extremely liberal jurisdictions, you can even buy it in a vending machine.<ref>E.g. [[Seattle]]</ref>