Prevalence of Drug Use Worldwide

"It is estimated that 1 in 20 adults, or a quarter of a billion people aged 15-64 years, used at least one drug in 2014. Although trends in drug use vary across regions, as does updated reporting on data, the extent of drug use among the world population has remained stable over the past four years. Almost 12 per cent of the total number of people who use drugs, or over 29 million people, are estimated to suffer from drug use disorders."

Source: 

United Nations Office on Drugs and Crime, World Drug Report 2016 (United Nations publication, Sales No. E.16.XI.7), p. 1.
http://www.unodc.org/wdr2016/
http://www.unodc.org/doc/wdr20...

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