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Flavoring compounds: Many vaping flavors contain acidic compounds that weaken enamel, making the tooth surface more porous and more susceptible to both nicotine staining and discoloration from the flavoring pigments themselves

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[57] In July 2018, an Air China aircraft made an emergency descent after a pilot's e-cigarette triggered a false smoke alarm in the air conditioning system, causing a loss of cabin pressure

[2] Hydrogen peroxide

Salivation : Saliva is secreted by salivary glands in the mouth and is used to wetten food and begin the digestive process

Although the proportion of smokers among a population of almost 127 million (2015 estimate) is still comparatively sizeable, it has experienced a creeping but steady decline according to research conducted by Euromonitor International (See Table 3)