In 2012, according to NIDA's Monitoring the Future study, only 6.5% of 8th graders, 17.0% of 10th graders, and 22.9% of 12th graders had used marijuana in the 30 days prior to taking the survey.
Teens who report daily marijuana use are a much smaller number. In 2012, only 6.5% of 12th graders reported smoking weed daily.
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National Institute on Drug Abuse. "Marijuana." DrugFacts Updated January 2014
National Institute on Drug Abuse. "Want to Know More?- Some FAQs about Marijuana." Marijuana: Facts for Teens Updated October 2013
National Institute on Drug Abuse. "Marijuana." Research Report Series Updated July 2012
The Partnership at DrugFree.org. "Marijuana." Drug Guide. Accessed April 2014.