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Johnston says decline in perceived risk contributes to rise in marijuana use among teens

May 03, 2012

Lloyd Johnston comments on a 2011 survey finding that 9% of teens admitted smoking marijuana 20-plus times in the prior month, a rate that’s increased 42% since 2008. Johnston says declining perception of risk plays a key role in this upturn. And “the fact that perceived risk is still falling portends a further increase in use,” he says.

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