Marijuana causes more harm to the adolescent brain than alcohol does, suggests a study in The American Journal of Psychiatry. Researchers followed 3,826 students in Montreal for four years, beginning when they were age 12 or 13. Each year, the students took a battery of cognitive tests measuring memory, reasoning and inhibitory control and filled out confidential surveys on their alcohol and marijuana use. On average, adolescents who increased their marijuana use in one year performed worse than expected on tests of memory and inhibitory control, both that year and the following year. The researchers did not find the same association between changes in alcohol use and cognitive performance. (Monitor on Psychology)

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