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"60 Minutes" examines effects of marijuana on body

Voters in California, Nevada, Arizona, Massachusetts and Maine will decide in November whether to legalize recreational marijuana. Marijuana use is still illegal under federal law, but 57 percent of Americans believe it should be legal. CBS News chief medical correspondent Dr. Jon LaPook joins "CBS This Morning" to preview his "60 Minutes" report on the impact of legalizing recreational marijuana in Colorado.
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