During the past half-century, recreational cannabis use has become almost as common as tobacco use among adolescents and young adults. Since its use was first reported more than 40 years ago in the United States, recreational cannabis use has spread globally to other developed countries and, more recently, low- and middle-income countries.

Regular cannabis use in adolescence approximately doubles the risks of early school-leaving and of cognitive impairment and psychoses in adulthood. Regular cannabis use in adolescence is also associated strongly with the use of other illicit drugs. 

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