1. Teen Drug Abuse -- Information from Healthwise
Some teens experiment with drugs or alcohol only a few times, but experimentation can become substance abuse and lead to serious problems, such as poor school performance, loss of friends, problems at home, and even lasting legal consequences.
http://www.everettclinic.com/kbase/topic/special/tp17749/sec1.htm

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3. Tracking Teen Drug Abuse Trends Over the Years
Tracking trends in teen drug abuse over the years Special Report. Over the course of its 24-year history, MTF has charted some significant changes in illicit drug use among America's school-aged children.
http://www.nida.nih.gov/NIDA_Notes/NNVol14N1/Teentrends.html