Source is the Wikimedia Commons:  This is a GIF image copy of that SVG/PNG image on the Commons.
Description: Lifetime prevalence of cannabis use among all adults (aged 15 to 64 years old) in nationwide surveys among the general population. For a table with the exact percentage for each nation see wikipedia:Adult lifetime cannabis use by country. For annual use see wikipedia:Annual cannabis use by country
Source data taken from EMCDDA (European Monitoring Centre for Drugs and Drug Addiction).  Survey year for each nation: Belgium (2004); Bulgaria (2005); Czech Rep. (2004); Denmark (2005); Germany (2003); Ireland (2002/03); Greece (2004); Spain (2005/06); France (2005); Italy (2005); Cyprus (2006); Latvia (2003); Lithuania (2004); Luxembourg (1998); Hungary (2003); Netherlands (2005); Austria (2004); Pland (2002); Portugal (2001); Romania (2004); Slovakia (2004); Finland (2005); Sweden (2006); UK (2004); Norway (2004).
Date: The map was made in January 2008
Author: User:Té y kriptonita on the Wikimedia commons.
Permission: See Wikimedia commons source. GNU Free Documentation license, Version 1.2 or any later version published by the Free Software Foundation.
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Note: This regional GMM city list is only through 2012. For the latest worldwide GMM city list...
Lifetime prevalence of cannabis use among all adults (aged 15 to 64 years old) in nationwide...