What won't kids these days smoke? Electronic-cigarette use among teens has doubled in the U.S., jumping from 4.7 percent in 2011 to 10 percent of high schoolers in 2012, according to a survey by the Centers for Disease Control. Scarily, usage has also doubled among middle-school students. The National Youth Tobacco Survey called the results "deeply troubling" and warned that e-cigarettes can hook kids on nicotine. The FDA has announced it will expand regulations to e-cigarettes as early as this fall.