Fortunately, there is a simple way to evaluate this hypothesis, at least on a preliminary basis, prior to waiting for the results of longitudinal studies. Enough youth are experimenting with electronic cigarettes, and the increase in youth e-cigarette use has been dramatic and sustained enough, that if the gateway hypothesis were correct, we would be starting to see an increase in smoking prevalence among youth due to the many new smoking initiates that were converted from e-cigarette experimentation to smoking.

Where in the world did these reporters get the idea that thirdhand smoke could possibly be as harmful as active smoking? After all, thirdhand smoke is merely the residue from tobacco smoke that is deposited on surfaces and exposure occurs after smoking is no longer taking place.

"It is not known how much nicotine or other potentially harmful chemicals are inhaled by users, nor is it known whether e-cigarette use may lead to use of other tobacco products. Neither are the benefits of using e-cigarettes over traditional products known."

5. The majority of dual users (e-cigarettes and cigarettes) are using e-cigarettes every day, and half are using at least two cartridges/disposables per day.

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