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Some examples of these include acetaldehyde, benzaldehyde, formaldehyde, glycerol, limonene, naphthalene, and N-Nitrosonornicotine (NNN) [40,41]

Vaping, which is what smoking an e- cigarette is called, may seem like a healthier alternative to a conventional cigarette, but they contain many of the same chemicals, as well as additional chemicals, often in significantly higher concentrations

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But there might be other undeclared dangerous chemicals, and it would be irresponsible to advocate for their use as an alternative for normal cigarettes before more research is done. Yach agrees