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National Trends in Youth Marijuana Use <br />Use of marijuana among youth (12 to 17 <br />year olds) rate increased from 6.7 <br />percent in 2008 to 7.9 percent in 2011 <br />The Monitoring the Future study found <br />that there has been an upward trend in <br />use over the past three to five years <br />among 10th and 12th graders <br /> <br />