World map of countries shaded according to the annual percentage of cannabis use. Sources:

World Drug Report 2011. United Nations Office on Drugs and Crime (UNODC). Cannabis stats are from  Chapter 6.1.1.3. Consumption: Annual prevalence of Cannabis, p. 217. "Sources: Annual Reports Questionnaires, Academic Researches, Concise International Chemical Assessment Documents (CICAD), Government Reports, European School Survey Project on Alcohol and Other Drugs (ESPAD), International Narcotics Control Strategy Reports (INCSR)."
World Drug Report 2006. United Nations Office on Drugs and Crime (UNODC). Cannabis stats are from Chapter 6.1.3. Consumption: Annual prevalence of Cannabis, p. 386. "Sources: Annual Reports Questionnaires, Government Reports, US Department of State, European Monitoring Center for Drugs and Drug Abuse (EMCDDA)."
Prevalencia de consumo de marihuana por mes. SENDA
Annual cannabis use by country
Jolly Janner