[USA] White House Drug Office Releases its Largest-Ever Compilation of Data Relating to Marijuana Abuse in the United States / Office of National Drug Control Policy, July 2008
http://www.whitehousedrugpolicy.gov/news/press08/072908.html
2008 Marijuana Sourcebook—Marijuana: The Greatest Cause of Illegal Drug Abuse / Office of National Drug Control Policy, July 2008
PDF - http://www.whitehousedrugpolicy.gov/news/press08/Marijuana_2008.pdf