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the effect of college drinking is like having a bad teacher

Drinking alcohol depresses college students’ academic performance by roughly the same amount as having a bad professor for an entire semester, according to a team led by Scott E. Carrell of the University of California, Davis. In a study of students at the US Air Force Academy, where underage drinking is tightly controlled, the researchers found that performance dropped by one-tenth of a standard deviation after students turned 21 and were allowed to drink, an effect that lasted 8 months and, surprisingly, was most pronounced for the best students.