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Carbonyls in cigarette smoke are formed mainly by pyrolysis of tobacco sugars83, whereas those in e-cigarettes are formed mainly by thermal degradation of PG and/or VG83,84,85. Flavourings may also contribute to the formation of carbonyls, as well as the characteristics of the e-cigarette devices, especially the applied voltage, coil resistance and wicking material47,48,49,86,87. Poor wicking efficiency may lead to a dry wick and overheated e-liquid (dry puff), which promotes the formation of carbonyls and other toxic compounds2,10,13,15. Coil location, orientation, resistance and wick material, as well as power output, have been shown to affect carbonyl generation significantly13,15,86.

Among adolescents who both vaped and smoked traditional cigarettes, a higher proportion in the This is Quitting program,&nbsp