E-cigarettes are gaining in popularity among high school and middle school students, according to a report released this month by the federal Centers for Disease Control and Prevention. The Omaha World-Herald reports that the National Youth Tobacco Survey found the number of high schoolers using e-cigarettes had doubled in 2012, to one in 10 kids. Last year 1.78 million high school and middle school students tried one. District officials in Omaha have warned parents they were seeing a rise in e-cigarette use among their high schoolers and reminded them that anyone caught “vaping” could face detention or suspension.