Hard to resist. But if they're marijuana edibles, not such a treat. James A. Guilliam/Getty Images hide caption

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Ohio's proposal to legalize recreational and medical marijuana is being met with opposition from residents who generally support legalizing pot. iStockphoto hide caption

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Marijuana at a medical marijuana dispensary in Los Angeles. Twenty-three states and the District of Columbia have legalized medical marijuana. David McNew/Getty Images hide caption

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Using chemicals to control bugs or mold is common among commercial cannabis growers. But with no federal oversight, experts are concerned growers may be using dangerous pesticides. Ted S. Warren/AP hide caption

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Polls show changing American opinion on marijuana, and it's having an effect on politics. Leon Neal/AFP/Getty Images hide caption

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Leaders of the Alaska Cannabis Club share a joint at their medical marijuana dispensary in Anchorage. On Tuesday, Alaska became the third state in the nation to legalize recreational marijuana use. Mark Thiessen/AP hide caption

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Deuel County Sheriff Adam Hayward shows off a container of confiscated marijuana in Chappell, Neb., in July. Nikki Kahn/The Washington Post/Getty Images hide caption

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A marijuana bud displayed in Denver. Don't legalize pot, the pediatricians say, but don't lock teenagers up for using it, either. Seth McConnell/The Denver Post/Getty Images hide caption

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Adam Eidinger, chairman of the D.C. Cannabis Campaign, puts up Initiative 71 posters in October. The measure to legalize possession of up to 2 ounces of marijuana was approved by a wide margin of local voters. Jacquelyn Martin/AP hide caption

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Officials in Aspen have put out a brochure on how to use marijuana safely and legally. Marci Krivonen hide caption

itoggle caption Marci Krivonen

Nebraska and Oklahoma say Colorado's marijuana law is unconstitutional, in a challenge to the law in the Supreme Court. Earlier this month, visitors from Texas smell marijuana at the Breckenridge Cannabis Club. Brennan Linsley/AP hide caption

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Volunteers with the DC Cannabis Campaign (left and center) talk to a voter on Election Day about the ballot initiative to legalize marijuana. The measure was approved, but its fate remains uncertain. Allison Shelley/Getty Images hide caption

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