The idea that vaping has lead to an increase in smoking amongst teens is not supported by the facts.
The 5 Best Drug Scares of 2013 - Reason.com
The CDC's data, which came from the 2012 National Youth Tobacco Survey (NYTS), did not support that claim. In fact, nine out of 10 high school students who reported vaping in the previous month were already cigarette smokers, suggesting that the increase in e-cigarette consumption might signal successful harm reduction. Last month the CDC reported additional NYTS data that further undermine Frieden's claim, showing that smoking among teenagers fell as vaping rose. . .
Does the gateway effect Frieden fears—a switch from e-cigarettes to conventional cigarettes among people who otherwise would never smoke—show up after high school? Not according to a recent survey of college students, in which only 3.3 percent said e-cigarettes were the first form of nicotine they'd tried. Of those, only one (2.3 percent) later started smoking conventional cigarettes. "It didn't seem as though it really proved to be a gateway to anything," the lead researcher said.
The 5 Best Drug Scares of 2013 - Reason.com