http://www.drugabuse.gov/ - National Institute on Drug Abuse. Helpful resources for parents and teens.
http://www.camh.ca/en/hospital/Pages/home.aspx - Centre for Addiction and Mental Health is Canada's largest mental health and addictions teaching hospital. Click under "Health Information" for helpful resources.
http://teenmentalhealth.org/ - Free resources aiming to increase mental health literacy for teens.
http://www.ccsa.ca/Pages/default.aspx - Canadian Centre on Substance Abuse changes lives by bringing people and knowledge together to reduce the harm of alcohol and other drugs on society.