E-Liquid

An e-liquid for forming an aerosol in a vaping define, the e-liquid comprising an inhibitor for inhibiting the formation of reactive carbonyl species (RCS) (i.e. a dicarbonyl compound, formaldehyde, acetaldehyde, glyoxal, methylglyoxal) within the e-liquid and/or the aerosol formed therefrom, wherein the inhibitor comprises at least one polyphenol compound (i.e. gallic acid, pyrogallol, homovanillic acid, hydroxytyrosol, epigallocatechin gallate, flavonoids, isoflavinoids, neoflavinoids, flavonols, flavanols, flavones, flavanones, isoflavones, anthocyanidins, anthoxanthins, catechin). The inhibitor may be present in the e-liquid in a concentration from 0.01mM - 1.0mM, preferably 0.05mM - 0.5mM. The e-liquid may further comprise glycerol and a glycol which make up at least 90% by weight of the composition. The e-liquid may be for use in e-cigarettes, electronic cigars, pipers, and/or shisha sticks, and also claimed is a vaping device comprising such an e-liquid. The e-liquid may reduce the risk of cancer, cardiovascular disease and/or respiratory disease caused by the inhalation of an aerosol produced from the e-liquid in a vaping device.