The CDC in Atlanta says more than a quarter-million teens who never smoked before used e-cigarettes last year. That's a three-fold increase from 79,000 in 2011 to 263,000 in 2013.

Doctor Tim McAfee said the figures are troubling because nicotine is highly addictive and can be harmful to adolescent brain development. He said three out of four teen smokers go on to become adult smokers, even if they intend to quit.

[Metro Networks]