Similar data from the U.S. would be very helpful. But unlike prior reports, these ones should quantify not only experimentation, but also regular use, stratified by prior status as smokers versus nonsmokers.

In fact, this is precisely what Trueba et al. demonstrated in a of changes in exhaled nitric oxide levels in 41 healthy college students.

While research is clearly needed to understand the trajectory of youth use of electronic cigarettes, the Monitoring the Future survey data do not support the CDC's conclusion that these products are serving as a gateway to youth smoking.

The rest of the story is that dual use is not necessarily a bad thing. In fact, it may for some be a gateway to smoking cessation.

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