"Globally, drug use is not distributed evenly. In general, the US had among the highest levels of use of all drugs. Much lower levels were observed in lower income countries in Africa and the Middle East, and lower levels of use were reported in the Asian locales covered."
Degenhardt, Louisa; Chiu, Wai-Tat; Sampson, Nancy; Kessler, Ronald C.; Anthony, James C.; Angermeyer, Matthias; Bruffaerts, Ronny; Girolamo, Giovanni de; Gureje, Oye; Huang, Yueqin; Karam, Aimee; Kostyuchenko, Stanislav; Lepine, Jean Pierre; Mora, Maria Elena Medina; Neumark, Yehuda; Ormel, J. Hans; Pinto-Meza, Alejandra; Posada-Villa, Jose´; Stein, Dan J.; Takeshima, Tadashi; Wells, J. Elisabeth, "Toward a Global View of Alcohol, Tobacco, Cannabis, and Cocaine Use: Findings from the WHO World Mental Health Surveys," Plos Medicine (Cambridge, United Kingdom: Public Library of Science, July 2008) Vol. 5, Issue 7, p. e141.
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