The evidence on marijuana and health
JUSTIN SULLIVAN/Getty Images


Yesterday was 4/20 day in Colorado, and the police busted a few people for public consumption in Denver.
This is a good opportunity to investigate: What effects does marijuana use have on health? Aaron Carroll of The Incidental Economist takes a look below. --Ryan Cooper
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Ryan Cooper is a national correspondent at TheWeek.com. His work has appeared in the Washington Monthly, The New Republic, and the Washington Post.
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