An activist holds a placard depicting cannabis leaves during a protest in Kyiv in May 2017. Ukraine is moving closer to legalizing medical cannabis, fueled in part by Russia's war. Sergei Supinsky/AFP via Getty Images hide caption
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legalizing marijuana
Come Jan. 1 it will be legal to smoke recreational marijuana in Illinois. But housing authorities say it will remain prohibited in public housing. Susan Montoya Bryan/AP hide caption
Marijuana plants grow in a marijuana cultivation facility on July 6, 2017 in Las Vegas, Nevada. Ethan Miller/Getty Images hide caption
California's legislature passed a bill Wednesday that would require officials to review all marijuana-related convictions from 1975 until 2016, when pot was legalized in the state. Taylor Weidman/Bloomberg via Getty Images hide caption
Scientists are finding that, just as with secondhand smoke from tobacco, inhaling secondhand smoke from marijuana can make it harder for arteries to expand to allow a healthy flow of blood. Maren Caruso/Getty Images hide caption
Are There Risks From Secondhand Marijuana Smoke? Early Science Says Yes
Marijuana plants are grown for medicinal purposes in a clandestine greenhouse in Mexico City in 2015. Mexico legalized medical marijuana in 2017, but recreational pot remains largely illegal. Yuri Cortez/AFP/Getty Images hide caption
A worker packages medical marijuana in San Francisco in 2006. City prosecutors say they'll clear thousands of marijuana convictions. Justin Sullivan/Getty Images hide caption
Proponents of the emerging pot-for-pleasure industry want to grab a share of the nearly $2 billion tourism business in Sonoma County with events like dinners that incorporate marijuana. Courtesy of Sonoma Cannabis Company/Kristen Jeanne hide caption
Pairing Wine And Weed: Is It A California Dream Or Nightmare?
Shane Cavanaugh, owner of Amazon Organics, a pot dispensary in Eugene, Ore., arranges the cannabis display in his store in September 2015. Ryan Kang/AP hide caption
Krystal Xiques smokes marijuana at a rally in support of Prop 64 at Sparc Dispensary in San Francisco on Tuesday. Marcio Jose Sanchez/AP hide caption
Marijuana grows in the home of two medical marijuana patients in Medford, Ore. Jeff Barnard/AP hide caption
How The 'Cannabis Catch-22' Keeps Marijuana Classified As A Harmful Drug
Washington State Patrol sergeant Nate Hovinghoff says once pot was legalized in Washington state the rules of engagement changed. Courtesy Austin Jenkins/Courtesy Austin Jenkins hide caption
Legalizing Marijuana: It Changes Policing, But May Leave Racial Disparities
As More States Consider Legalizing, Questions About Pot And The Brain
Lisa Olson, of Mesa, Ariz., uses marijuana to ease the symptoms of multiple sclerosis. Stina Sieg/KJZZ hide caption
Marijuana's Mainstream Move Triggers Different Kinds Of Family Talks
Ohio's proposal to legalize recreational and medical marijuana is being met with opposition from residents who generally support legalizing pot. iStockphoto hide caption
Fears Of Marijuana 'Monopoly' In Ohio Undercut Support For Legalization
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
Concern Grows Over Unregulated Pesticide Use Among Marijuana Growers
A user prepares to roll a marijuana cigarette on the first day of legal possession of marijuana for recreational purposes in the District of Columbia on Thursday. Alex Brandon/AP hide caption
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
Nebraska Says Colorado Pot Isn't Staying Across The Border
Low-dose pot-infused cookies, called the Rookie Cookie, sit on the packaging table Sept. 26 at The Growing Kitchen in Boulder, Colo. The state legalized recreational pot use last year. Brennan Linsley/AP hide caption
The overwhelming majority of people think there should be age restrictions on the recreational use of marijuana. Ben Nelms/Reuters/Corbis hide caption