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.

Moreover, the ingredients of electronic cigarettes are well known. Even the components of electronic cigarette vapor have been well characterized. In fact, we know a lot more about the components of electronic cigarette vapor than we do about those of cigarette smoke.

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