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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 jurisdictions when prescribed as by a physician.<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. In only one country in the world, the Netherlands, the sale of marijuana in small quantities is reportedly allowed by law enforcement.</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 jurisdictions when prescribed as by a physician.<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 users consume the drug, whether smoked, vaporized, or in food products, for a feeling of euphoria and relaxation. However, even users widely recognize that marijuana consumption can cause paranoia, as well as compromise the ability to drive a motor vehicle or respond to emergencies. The effects of THC can include short-term memory loss, malaise, psychosis in predisposed individuals, violence and violent fits, as well as impairment of physical and mental functioning. Some researchers claim that cannabis has "medicinal" benefits (see [[Medical marijuana]]); but many scientists contest this, and state that there are numerous federally approved medicines for the diseases that "medicinal" marijuana has been used to treat.

Marijuana users consume the drug, whether smoked, vaporized, or in food products, for a feeling of euphoria and relaxation. However, even users widely recognize that marijuana consumption can cause paranoia, as well as compromise the ability to drive a motor vehicle or respond to emergencies. The effects of THC can include short-term memory loss, malaise, psychosis in predisposed individuals, violence and violent fits, as well as impairment of physical and mental functioning. Some researchers claim that cannabis has "medicinal" benefits (see [[Medical marijuana]]); but many scientists contest this, and state that there are numerous federally approved medicines for the diseases that "medicinal" marijuana has been used to treat.