Iowa Attorney General Tom Miller today urged the U.S. Food and Drug Administration to prohibit the sale of electronic cigarettes to minors, and restrict their ingredients and advertising. In a bipartisan letter signed by attorneys general in 36 states and three U.S. territories, Miller urged the FDA to immediately take all available measures to regulate electronic cigarettes, or "e-cigarettes," as "tobacco products" under the Tobacco Control Act. Unlike traditional tobacco products, there are no federal age restrictions that prevent children from obtaining the battery-operated products, which heat liquid nicotine into a vapor that the user inhales. Nearly 1.8 million middle and high school students have tried e-cigarettes, according to a 2012 survey by the U.S. Centers for Disease Control and Prevention.