The Straight Dope: Studies Link Parental Monitoring With Decreased Teen Marijuana Usage

ScienceDaily, 17 Nov. 2009. "Marijuana is the most widely used illicit drug by adolescents, with almost 42% of high school seniors admitting to having experimented with it. Continued marijuana use may result in a number of serious consequences including depression, cognitive impairment, cardiovascular disease, and certain forms of cancer. As such, it is critical to prevent marijuana use by adolescents and numerous behavioral and medical scientists have been trying to establish the best means of prevention."

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http://www.sciencedaily.com/releases/2009/11/091116143623.htm