Because "electronic cigarettes" don't deliver tobacco, they are excluded from even the Food and Drug Administration's authority to regulate tobacco products.
That should change as data accrue regarding the use and effects of the devices.
E-cigarettes are battery-powered devices that heat liquid nicotine that is delivered as a vapor.
The liquids often incorporate flavors such as fruits, mint or coffee.
"Vaping," as the practice is called, has fostered a $2.1-billion-a-year industry that rapidly is growing.