People at a Denver party early this month celebrate the recognition of an amendment to the Colorado constitution legalizing recreational use of marijuana. Brennan Linsley/AP hide caption

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A woman, identified only as "Hurricane," lights up in Seattle. Washington state's law legalizing the recreational use of marijuana went into effect on Dec. 6. Cliff Despeaux /Reuters /Landov hide caption

itoggle caption Cliff Despeaux /Reuters /Landov

A young man with a joint in his left hand jokes with the photographer as he passes a sign prohibiting the use of marijuana and alcohol, in a designated area in Amsterdam on Wednesday. The city's mayor says students would be formally banned from smoking marijuana at school as of Jan. 1, 2013. Peter Dejong/AP hide caption

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Did eating binges come first? iStockphoto.com hide caption

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A young cannabis plant at grows at The Joint Cooperative in Seattle, Washington Jan. 27. Cliff DesPeaux/Reuters/Landov hide caption

itoggle caption Cliff DesPeaux/Reuters/Landov

Maine voters overturned a gay marriage law through a citizens' veto in 2009. Maine voted again on the issue today, thanks to an initiative put on the ballot by voter petition. Above, gay marriage supporters gather at a rally outside of City Hall in Portland on Sept. 10. Joel Page/AP hide caption

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Brian Lawson rolls a marijuana cigarette at the BC Marijuana Party Headquarters in Vancouver, British Columbia. Vancouver is in the marijuana-friendly corner of Canada. Jae C. Hong/AP hide caption

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