NORWALK - A popular device aimed at helping smokers kick the habit is causing more addiction among youths, according to a new study.

The report, issued by the Centers for Disease Control and Prevention, says the use of electronic cigarettes among teens and pre-teens has more than doubled since 2011. It also concludes that one-third of young e-cigarette users will move on to regular cigarettes, and that one-third of that population will become chronic smokers.

E-cigarettes are smokeless, but some doctors say they're only good for people trying to quit.