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Cannabis, also known as marijuana (Spanish pronunciation: [maɾiˈwana]) among other names,[a] is a psychoactive drug from the Cannabis plant used primarily for medical or recreational purposes. The main psychoactive component of cannabis is tetrahydrocannabinol (THC), which is one of the 483 known compounds in the plant,including at least 65 other cannabinoids,including cannabidiol (CBD). Cannabis can be used by smoking, vaporizing, within food, or as an extract.

Cannabis has various mental and physical effects, which include euphoria, altered states of mind and sense of time, difficulty concentrating, impaired short-term memory and body movement,relaxation,and an increase in appetite.Onset of effects is felt within minutes when smoked, and about 30 to 60 minutes when cooked and eaten.The effects last for two to six hours, depending on the amount used. At high doses, mental effects can include anxiety, delusions (including ideas of reference), hallucinations, panic, paranoia, and psychosis. There is a strong relation between cannabis use and the risk of psychosis,hough the direction of causality is debated.Physical effects include increased heart rate, difficulty breathing, nausea, and behavioral problems in children whose mothers used cannabis during pregnancy;short-term side effects may also include dry mouth and red eyes. Long-term adverse effects may include addiction, decreased mental ability in those who started regular use as adolescents, chronic coughing, and susceptibility to respiratory infections.

Cannabis is mostly used recreationally or as a medicinal drug, although it may also be used for spiritual purposes. In 2013, between 128 and 232 million people used cannabis (2.7% to 4.9% of the global population between the ages of 15 and 65).It is one of the most commonly used drugs in the world,and used both legally and illegally, with the highest use among adults (as of 2018) in Zambia, the United States, Canada, and Nigeria.While cannabis plants have been grown since at least the 3rd millennium BCE,evidence suggests that it was being smoked for psychoactive effects at least 2,500 years ago in the Pamir Mountains;the earliest evidence found at a cemetery in what is today western China close to the tripoint with Tajikistan and Afghanistan. Since the early 20th century, cannabis has been subject to legal restrictions. The possession, use, and cultivation of cannabis is illegal in most countries of the world.In 2013, Uruguay became the first country to legalize recreational use of cannabis.Other countries to do so are Canada, Georgia, and South Africa, along with 11 states and the District of Columbia in the United States (though the drug remains federally illegal).Medical use of cannabis, requiring the approval of a physician, has been legalized in many countries.

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