Electronic Cigarettes Vs. E Cigarettes

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Electronic cigarettes (e-cigarettes) are devices that deliver aerosolized nicotine to the user by heating a liquid (typically propylene glycol) containing nicotine and flavoring agents. Most devices share a common design – a plastic tube containing a battery, an airflow sensor, a heating element and a cartridge containing the liquid (Figure 1).

Figure 1. Components of the Electronic Cigarette.(1)
Theoretically,(2) frequently advertised,(3) and commonly assumed by users,(4-12) this process avoids the harmful byproducts of combustible tobacco. Moreover, users cite considerable financial savings(4,5) using e-cigarettes over combustible cigarettes – i.e. $846 per year compared to $2190.(13) E-cigarettes are often marketed as a way to beat public smoking restrictions,(3) and users frequently claim this as one reason for consumption.(5,14)
E-cigarette use is increasing,(2,4,5,7-9,12,14-21) with annual revenue surpassing $1 billion in 2013.(22)
The e-cigarette format, however, does not eliminate concerns regarding public and individual health risks. The World Health Organization has called for e-cigarette usage to be monitored in the same way as more conventional tobacco products,(23) the US FDA is advocating for more research,(24) and there has been a dramatic increase in analyses of the chemical, physiological, psychological and socio-cultural aspects of e-cigarettes.(2-7,9-12,14-21,24-52)
Concerns about e-cigarette use include, the health effects of nicotine, the
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