Children — like adults — are increasingly trying electronic cigarettes, according to the first large U.S. study to gauge use by teenage students.
Health officials say the study suggests many kids are now getting a first taste of nicotine through e-cigarettes and moving on to regular tobacco products.
The devices began to appear in the United States in late 2006, but marketing has exploded in the last couple of years.
About 2 percent of students said they'd used an e-cigarette in the previous month, according to the survey done last year. That was up from 1 percent in 2011.
More kids still smoke traditional cigarettes than the new electronic ones, and it's not clear how dangerous e-cigarettes are. It's also not clear from the report how many children are using them on a daily or weekly basis.
Electronic cigarettes are battery-powered devices that provide users with aerosol puffs that typically contain nicotine, and sometimes flavorings like fruit, mint or chocolate. They've often been described as a less dangerous alternative to regular cigarettes.
Unlike regular cigarettes, the federal government does not regulate e-cigarettes, although about 20 states have banned store sales to minors.
The new study — released Thursday by the Centers for Disease Control and Prevention — is based on a questionnaire filled out by nearly 19,000 middle and high school students in 2011 and another 25,000 in 2012.
In 2011, about 3 percent said they'd tried an e-cigarette at least once. That rose to 7 percent last year and translates to nearly 1.8 million students.
In contrast, 6 percent of adults have tried e-cigarettes, according to a different CDC survey done in 2011.
Children still are more likely to light up regular cigarettes, though teen smoking rates have dropped in the past decade. More teens now smoke marijuana than tobacco, surveys have found.