The FDA warns that more research needs to be done on the health risks of inhaling liquid nicotine.

“The FDA has said that it plans to assert regulatory authority over electronic cigarettes. And that could lead to them being regulated in the same way as cigarettes as far as marketing is concerned,” Felberbaum says…

“The companies are not allowed to market them as smoking cessation devices because that would put them in the category of other nicotine replacement products that are regulated by the FDA, such as nicotine gum or patches,” Felberbaum says.

So for now, e-cigarette smokers can pretty much puff away, and they are.
Industry experts say U.S. sales could even reach 1 billion this year.