SIGNIFICANT NUMBERS AND RISING. “By the end of 2009, at least 25 studies reported surveys of college students’ rates of nonmedical stimulant use. Of the studies using relatively smaller samples, prevalence was, in chronological order, 16.6% (lifetime); 35.3% (past year;), 13.7% (lifetime;), 9.2% (lifetime;), and 55% (lifetime, fraternity students only.”
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