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For example, a large study of all available data to date determined that there is conclusive evidence that e-cigarettes contain and produce a number of known and potentially toxic substances

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So we probably need a few more studies (and perhaps from some different sources) before we can categorically say if vaping stains your teeth or not

Smokers themselves were skeptical that the labels would have much effect

There is more reason to believe that lower cigarette consumption will reduce the risk of chronic lung disease and lung cancer, the other two big causes of early death from smoking, but whether this occurs or not is less clear and the study team did not look at this. A new report released this week from the National Academies of Science, Engineering and Medicine found little evidence about the health risks of e-cigarettes but said they might be useful if used to help smokers cut down or quit

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