e-cig

The Food and Drug Administration and Federal Trade Commission on Tuesday sent warning letters to 13 manufacturers, distributors and retailers of e-cigarette liquids. In a phone briefing for reporters, FDA Commissioner Scott Gottlieb said the companies are endangering kids by marketing the products to resemble juice boxes, cookies or candy.

"You look at the lollipop for example. I don't see how my 4- or 5-year-old doesn't just look at that and see a lollipop. It's a lollipop," he said.

It's become an emotional debate: Do e-cigarettes help people get off regular cigarettes or are they a new avenue for addiction?

Until now, there has been little solid evidence to back up either side. But a new study from the Centers for Disease Control and Prevention could help fill that void.