A national study tracked the tobacco, alcohol, and marijuana use among 6th through 10th graders across 1998 through 2010. The findings showed a significant decline of each of these substances across the 12 years of the study. Of particular interest, the most significant decline was among the younger grades, suggesting to researchers that there may be a future reduction in tobacco, alcohol, and marijuana among high school students.
Abstract: Trends in Substance Use Among 6th-to 10th-Grade Students From 1998 to 2010: Findings From a National Probability Study, The Journal of Early Adolescence
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