Children getting first taste of nicotine through e-cigarettes
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% 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% 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 flavourings like fruit, mint or chocolate. They've often been described as a less dangerous alternative to regular cigarettes.
Unlike regular cigarettes