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How Do Perception of Harm, Disapproval, and Availability Affect Drug Use?

As perception of harm and disapproval rises, use decreases even though availability remains constant, as shown by the trends in marijuana use among 12th graders.

Availability: % saying fairly easy or very easy to get marijuana Perception: % disapproving of smoking marijuana occasionally Risk: % saying great risk of harm in regular use of marijuana Use: % using marijuana once or more in past 30 days.