Marijuana use among U.S. high school seniors is leveling off, ending four years of increases in annual prevalence, according to a government-funded survey.
Thirty-six percent of high school seniors surveyed in 2012 said they smoked marijuana at least once in the previous year, the National Institute on Drug Abuse said today. The share of seniors using pot daily rose to 6.5 percent, from 5.1 percent a year ago, the study, called Monitoring the Future, shows.
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