Feb 27, 2013 4:16 PM by NBC News
New research reveals one in four tenth graders have smoked pot.
The data come from the National Institute on Drug Abuse which surveyed more than 2,500 tenth grade students.
35% of the teens said they had drunk alcohol during the past 12 months and 19% had smoked cigarettes.
Researchers say teens who used multiple substances had higher rates of physical ailments, depression, anxiety, and sleep problems.
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