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"Marijuana is the most popular illegal drug used worldwide, but addictions to popular painkillers like Vicodin, Oxycontin and codeine kill the most people, according to the first-ever global survey of illicit drug abuse."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-08-marijuana-illegal-drug-worldwide.html>