Re: What are the respiratory effects of e-cigarettes?
The “vaping associated respiratory syndrome”  is a new phenomenon that needs further research and rethinking. Prima facie it seemed that, being devoid of tar and other noxious components of the tobacco qualm, e-cigarettes would be not carcinogenic and less harmful for the airways than combustible cigarettes. The argument in favour of the use and sale of e-cigarettes is simple: they are safer than cigarettes, and, potentially, they can help smokers to quit . As a stress coping strategy, an e-cigarette seems to be preferable to other tobacco products and, in some circumstances, to an alcoholic drink . The fact that e-cigarettes are promoted by the tobacco industry does not necessarily mean that they are harmful. Excessively restrictive policies on e-cigarettes up to prohibitions in some countries are hardly justified.
A significant disadvantage of e-cigarettes is a potential relapse of the nicotine dependence i.e. that some former smokers would restart, which might be associated with cardiovascular and other health risks especially for aged individuals. Moreover, e-cigarette use among young people is a risk factor for subsequent initiation of combustible cigarettes . For people with nicotine dependence combined with chronic respiratory diseases, a change from tobacco smoking to e-cigarettes may be favourable bearing in mind the final goal of smoking cessation .
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Competing interests: No competing interests