For the first time, more teens are trying e-cigarettes than the traditional tobacco ones.
A survey of high school students taken last year shows nearly half had tried vaping, which includes e-cigarettes and hookah.
But only a third admitted even taking one puff of a tobacco cigarette.
Experts aren't sure yet of the long-term effects of e-cigarettes, which use liquid nicotine.
But, they say parents need to be aware there could be risks, and when they talk to their kids about tobacco, they should discuss all types of smoking.
Survey: More teens try vaping than tobacco