In this study, the authors study attempted to determine the number of electronic cigarette products on the market, both in terms of the number of different brands and the number of different flavors. Using comprehensive internet searches, the researchers found as follows:

Well, Polosa et al. have conducted exactly such a . They examined the changes in asthma symptoms among smokers who continue to smoke versus those who switch to electronic cigarettes. These investigators reported that in contrast to real cigarettes, the fake ones result in actual harm reversal. Lung function, asthma control, and asthma symptoms were significantly improved among patients who switched from regular cigarettes to electronic cigarettes. These improvements were even observed among patients who became dual users of both real and fake cigarettes.

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