http://www.samhsa.gov/
Site of the Substance Abuse and Mental Health Administration of the U.S. Department of Health and Human Services. Has numerous resources on all kinds of drug use and abuse.

http://www.nida.nih.gov/
The National Institute on Drug Abuse site contains news, publications, and links to other sources.

http://ash.org
The Action on Smoking and Health home page, providing information on nonsmokers' rights, smoking statistics and information, and help for stopping.