Health officials say the number of children trying electronic cigarettes is on the rise.
According to a 2012 survey published Thursday by the Centers for Disease Control and Prevention, the percentage of middle and high school students who used e-cigarettes more than doubled from 2011 to 2012.
The findings from the National Youth Tobacco survey show the percentage of high school students who reported ever using an e-cigarette rose from 4.7 percent in 2011 to 10 percent in 2012.
Overall, in 2012 more than 1.78 million middle and high school students nationwide had tried e-cigarettes.
The study also found that 76.3 percent of students who used e-cigarettes within 30 days also smoked conventional cigarettes in the same time period.