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Retrieved June 24, 2008

Additionally, the CDC noted that there was a "significant decrease" in cigarette smoking amongshigh school students between 2011 and 2015, from 15.3 percent to 9.3 percent respectively

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The Western Journal of Medicine 158 , 635 (1993)

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It was not possible to exclude all individuals with respiratory illness because this information was not available in an appropriate form from the baseline questionnaire