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First, primary filtration systems such as HEPA filters trap the solid particles, while secondary systems, including activated carbon filters and UV-C light, neutralize the odor and some of the invisible foes

[4] The Missionary Herald of the Baptist Missionary Society , January 1885 (London: Alexander & Shepheard, 1885), 33

A review of popular vaping misconceptions: redefining ENDS safety and usage risks Shaligram Sharma, Laura Crotty Alexander, Maureen Meister, Cassandra Ross, Joseph Hess, Kenneth Ray, Alexandra Nol, Jonathan Shannahan, Christa Wright Inhalation Toxicology 7

Although some studies have shown that the nicotine in cigarettes can improve concentration and attention (making smokers feel more alert), there's more to cigarettes than just nicotine