http://teens.drugabuse.gov/facts/facts_mj1.php
http://alcohol-facts.com/Alcoholism_Facts.html
http://www.justthinktwice.com/drugfacts/
http://www.drugfreeworld.org/drugfacts.html
http://www.theantidrug.com/drug-information/marijuana-facts/default.aspx
6. CDC — YOUTH AND TOBACCO USE
http://www.cdc.gov/tobacco/data_statistics/fact_sheets/youth_data/tobacco_use/index.htm
http://www.abovetheinfluence.com/facts/
8. THE TRUTH
http://www.thetruth.com/facts/
http://iml.jou.ufl.edu/projects/Fall2000/Liu/anti_facts.html