Local governments are cracking down e-cigarette use and now the federal government is looking at its own regulations.

Those regulations include a ban on vending machine sales of e-cigarettes where children may be present, adding a health warning and setting an age limit.

"We don't know what's in the products, we don't know who is using them, how they're being used -- although there are alarming reports of large numbers of kids initiating e-cigarette use," Dr. Mitch Zeller, director of the FDA's Center for Tobacco Products, said. 

Zeller calls the situation alarming.