NIDA is a government agency that does research on drug abuse. There is excellent information on drugs of abuse and aspects of treatment on this site.
The Substance Abuse and Mental Health Services Administration works to improve the quality and availability of substance abuse prevention, alcohol and drug addiction treatment, and mental health services.
The Substance Abuse and Medical Health Data Archive (SAMHDA), provides a rich resoures for research, conferences, studies, and data pertaining to mental health and chemical substance abuse.
The Monitoring Future website contains information about the Monitoring Future Survey conducted each year by the University of Michigan. The Monitoring Future Survey report presents a summary of the national results on adolescent drug use, with emphasis on recent trends in the use of licit and illicit drugs.