http://www.unodc.org/unodc/world_drug_report.html
"Some 200 million people, or 5 percent of the global population age 15-64, have used illicit drugs at least once in the last 12 months. Among this population are people from almost every country on earth. More people are involved in the production and trafficking of illicit drugs and still more are touched by the devastating social and economic costs of this problem. Reliable analysis and statistics on the production, trafficking and use of illicit drugs are rare. The World Drug Report provides one of the most comprehensive overviews of illicit drug trends at the international level. In addition, it presents a special thematic chapter on cannabis, by far the most widely produced, trafficked and used drug in the world." Links to AV resources
PDF links:
Volume 1: Analysis - Full Report
Volume 2: Statistics - Full Report