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Vape aerosols may also increase the risk of heart disease, lung cancer, and asthma complications. The substitution was especially evident among cigarette brands popular with young people aged 20 and under, suggesting that flavor restrictions may increase smoking among youth as well as adults. The immense popularity of electronic cigarettes, or e-cigarettes, among young people has led many policymakers to restrict the sale of flavored varieties. Proponents of e-cigarettes claim they’re safer than smoking because they don’t contain the more than 60 cancer-causing chemicals in tobacco smoke and are not combustible. But e-cigs still deliver harmful chemicals, including nicotine, the extremely addictive substance in cigarettes.
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 some instances, because of its appearance and the vapours it emits, an e-cigarette may be confused with a regular cigarette. Other types of e-cigarettes, however, are similar to a cigar, a smoking pipe, or a ballpoint pen in appearance. This story has been updated to correct that two of the four menthol e-cigarettes from Njoy are disposable products.
Other important components in the aerosols include silicate particles from the fiberglass wicks or silicone [89,90,91]. Many of these products are known to cause abnormalities in respiratory function and respiratory diseases [89,90,91], but more in-depth studies are required. Interestingly, the battery output voltage also seems to have an impact on the cytotoxicity of the aerosol vapours, with e-liquids from a higher battery output voltage showing more toxicity to A549 cells [30]. The lethal dose of nicotine for an adult is estimated at 30–60