European Monitoring Centre for Drugs and Drug Addiction
The EMCDDA provides information on drugs and drug addiction in the EU.

Legacy Tobacco Documents Library
A huge collection of documents relating to tobacco product marketing, advertising, manufacturing and scientific research. This electronic library is a project of the University of California, San Francisco.

Office of National Drug Control Policy
This site is a good site for U.S. policy on drug abuse, including prescription drug abuse, and prevention. Includes policy documents, fact sheets and information on international partnerships.

World Health Organization
Essential Medicines and Pharmaceutical Policies page.