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Kasza's group also pointed to dual use of cigarettes and e-cigarettes, which has increased over time and usually involves smoking cigarettes more frequently than using e-cigarettes. "Individuals who dual use remain exposed to cigarette smoking toxicants, making complete rather than partial substitution of cigarettes with e-cigarettes important for risk reduction," they wrote. "Indeed, healthcare clinicians are now encouraged to discuss e-cigarettes as a cessation tool with patients who smoke cigarettes and have already tried FDA-approved cessation medications." A comparison of the serum levels of nicotine from e-cigarette or conventional cigarette consumption has been recently reported [39].

In contrast, other studies found acute microvascular endothelial dysfunction, increased oxidative stress and arterial stiffness in smokers after exposure to e-cigarettes with nicotine, but not after e-cigarettes without nicotine (reviewed in [20]). In women smokers, a study found a significant difference in stiffness after smoking just one tobacco cigarette, but not after use of e-cigarettes (reviewed in [20]). However, research updates on, and analysis of, the potential health benefits/risks of e-cigarettes are outside the scope of TobaccoTactics. These devices come in a variety of shapes and sizes, as pictured below, with several different names. Some e-cigarettes look like regular cigarettes, but many resemble pens or USB flash drives, and are not recognized as tobacco products. Larger e-cigarettes such as tank systems, or "mods," do not resemble other tobacco products.

Given their relatively recent introduction, there has been little time for a scientific body of evidence to develop on the health effects of e-cigarettes. Notably, the reverse was not true—students who said they smoked cigarettes were no more likely to report use of e-cigarettes when asked approximately 6 months later. Electronic cigarettes, or e-cigarettes, are tobacco products that have been sold in the U.S. for about a decade. They include e-pens, e-pipes, e-hookah, and e-cigars, known collectively as ENDS—electronic nicotine delivery systems. They're also sometimes called JUULs, "vapes" and "vape pens." E-cigarettes are the most commonly used tobacco products among kids—and it's become an epidemic. While much remains to be determined about the lasting health consequences of e-cigarettes, there’s evolving evidence about the health risks of e-cigarettes on the lungs—including irreversible lung damage and lung disease.

Starting to use e-cigarettes or switching from tobacco products to e-cigarettes increases your risk of adverse health effects. Interestingly, there is a strong difference of opinion on e-cigarettes between countries. Whereas countries such as Brazil, Uruguay and India have banned the sale of e-cigarettes, others such as the United Kingdom support this device to quit smoking.

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