(CNBC) Nearly one quarter of teens are using marijuana, according to a new survey.
Of eighth, 10th and 12th graders surveyed, 24 percent said they've used the drug in the past year, according to research from the University of Michigan. The 1.3 percent increase is the first significant rise in seven years.
The increase in teens using marijuana comes as more states legalize pot for medical and recreational use.
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