A worker at Boka Tobacco auction floors displays some of the tobacco crop, in Harare, Zimbabwe, Tuesday May 14, 2013. The country's tobacco selling season kicked off in February and to date tobacco worth over $400 million dollars has been sold to buyers mostly from China and the European Union. Tsvangirayi Mukwazhi/AP hide caption

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A woman smokes a cigarette in a Beijing shopping market, even though the practice is now banned inside public spaces. Kevin Frayer/Getty Images hide caption

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Food companies can make safety evaluations of their products in secret without ever telling the Food and Drug Administration. Luciano Lozano/Ikon Images/Corbis hide caption

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Will this maker of snus, an alternative to cigarettes, be allowed to claim it is less harmful? Swedish Match hide caption

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An employee in a Sydney bookshop in 2012 adjusts packaged cigarettes, which have to be sold in identical olive-brown packets bearing the same typeface and largely covered with graphic health warnings. William West/AFP/Getty Images hide caption

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Marvin Eaton owns a farm in Belew's Creek, N.C., where he grows 200 acres of tobacco. He bought the farm from his grandfather and plans to pass it down to his son. Emily McCord/WFDD hide caption

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Smoking has declined by about 4 percent annually in Uruguay since the country required graphic warnings on cigarette packages. Matilde Campodonico/AP hide caption

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A woman tries electronic cigarettes at a store in Miami. Joe Raedle/Getty Images hide caption

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High school students whose friends posted photos of drinking and smoking were about 20 percent more likely to become drinkers or smokers themselves. iStockphoto hide caption

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Smoking can mess up your looks, according to an ad campaign aimed at keeping teens from smoking. Courtesy of U.S. Food and Drug Administration hide caption

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Tobacco companies incorporated doctors in their ads, such as this 1930 Lucky Strike campaign, to convince the public that smoking wasn't harmful. Stanford University hide caption

itoggle caption Stanford University