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We would argue that further studies with chronic administration of low doses of nicotine are required to clearly evaluate its impact on carcinogenicity. In this line, a study compared the acute impact of CS vs. e-cigarette vaping with equivalent nicotine content in healthy smokers and non-smokers. Both increased markers of oxidative stress and decreased NO bioavailability, flow-mediated dilation, and vitamin E levels showing no significant differences between tobacco and e-cigarette exposure (reviewed in [20]). Inasmuch, short-term e-cigarette use in healthy smokers resulted in marked impairment of endothelial function and an increase in arterial stiffness (reviewed in [20]). Similar effects on endothelial dysfunction and arterial stiffness were found in animals when they were exposed to e-cigarette vapor either for several days or chronically (reviewed in [20]).

The composition of e-liquids requires stricter regulation, as they can be easily bought online and many incidences of mislabelling have been detected, which can seriously affect consumers’ health. Beyond their unknown long-term effects on human health, the extended list of appealing flavours available seems to attract new "never-smokers", which is especially worrying among young users. Additionally, there is still a lack of evidence of e-cigarette consumption as a smoking cessation method. Indeed, e-cigarettes containing nicotine may relieve the craving for smoking, but not the conventional cigarette smoking habit.

Although e-cigarettes do not give off smoke like tobacco cigarettes, they do expose people to secondhand aerosol or "vapor" that may contain harmful substances. Scientists are still learning about the health effects of being exposed to secondhand e-cigarette aerosol. The FDA monitors the national usage rates for all tobacco products, including an annual youth survey, and has seen a drastic increase in youth use of e-cigarette products in recent years.

E-cigarettes, also known as e-cigs, vapes, vape pens, and electronic nicotine delivery systems (ENDS), are experiencing rapid growth in popularity, especially among teens and young adults. They come in a variety of forms, sometimes looking like USB flash drives, pens, and other items that make them hard for parents and teachers to spot. Other electronic devices that heat tobacco instead of liquid nicotine, such as IQOS, are not considered e-cigarettes. Teens cannot participate in such studies, but "we all agree that e-cigs are not a good thing for youth and nonsmokers," Dr. Baldassarri says. The Food and Drug Administration on Friday authorized the first menthol-flavored&nbsp