FILE - A sales associate demonstrates the use of a electronic cigarette and the smoke like vapor that comes from it in Aurora, Colo. on Wednesday, March 2, 2011. Children - like adults - are increasingly trying electronic cigarettes, according to the first large national study to gauge use by middle and high school students. About 2 percent of the students said they’d used an e-cigarette in the previous month, according to a survey done in 2012. That was up from 1 percent in 2011. Results were released Thursday, Sept. 5, 2013 by the Centers for Disease Control and Prevention.