The number of high schoolers using e-cigarettes has tripled since 2011

Another year, another uptick in the number of youth puffing on vaporized tobacco. A new study by the Centers for Disease Control and Prevention (CDC) found that e-cigarettes are becoming increasingly popular among high school students, a trend the agency warns could undermine some of the progress made in reducing tobacco use among adolescents. "We've seen continued declines in tobacco use, but e-cigarette use is rising and that's troubling," said Brian King, senior adviser with the office on smoking and health at the CDC. "Any use is hazardous to the health of youths." The percentage of high school students who said they had used an e-cigarette in the past 30 days rose to 4.5 percent in 2013, a more than 60 percent jump from 2012 and roughly triple the number in 2011. The percentage of high school students who said they had ever tried an e-cigarette rose, too. Twelve percent said they had used an e-cigarette at some point, compared to 10 percent in 2012.