A issued by UC Riverside states unequivocally that this research finds thirdhand smoke to be every bit as harmful as active smoking.

And furthermore, there is no evidence that electronic cigarettes are causing nonsmoking youth to become regular users. In fact, there is no evidence that any substantial proportion of nonsmoking youth who tried these products are continuing to use them regularly (more than once per month).

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.

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