Seven -- yes, Middle school and high school students who use e-cigarettes are seven times more likely to begin smoking conventional cigarettes than those who shun the electronic nicotine delivery devices, according to data from the National Youth Tobacco Survey. And because unregulated e-cigs are cynically sold in kid-friendly flavors, such as chocolate and licorice, their potential to be a gateway to smoking tobacco is clear. Nicotine is addictive, even when delivered via an otherwise innocuous vapor. Kids need to know that.