An alternative to cigarettes once considered safer than smoking, is now causing concern with the Surgeon General.

FOX's Jon Decker has details from the White House:

Because it contains fewer of the harmful compounds of regular cigarettes, vaping was first pushed as safer for smokers. But the U.S. Surgeon General is calling e-cigarettes an emerging public health threat to the nation's youth.

Surgeon General Vivek Murthy acknowledges a need for more research, but says e-cigarettes are not harmless and too many teens are using them.

Federal figures show that last year, 16 percent of high school students reported at least some use of e-cigarettes.

At the White House, Jon Decker, FOX News.