Science Seeks to Unlock Marijuana's Secrets

More than 20 million Americans used marijuana in 2013. Possesion and sale are illegal under federal law, but medical marijuana use is legal in 23 states and the District of Columbia. Many states also have reduced or eliminated penalties for recreational use, resulting in a patchwork of restrictions and availability for those seeking medical help or just a casual high.

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URL: 
http://ngm.nationalgeographic.com/2015/06/marijuana/effects-graphic