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E-cigarettes, or “e-liquids”, have increased in popularity in recent years due to their variety of flavors and their use for “vaping” among youth. E-cigarette flavors [...] are made from fragrant aldehydes. These aldehydes mix with nicotine, propylene glycol (PG) and glycerol (VG) to make the typical e-liquids.

PG and VG are made of chemical alcohol components. Chemical alcohols and aldehydes can react to produce acetals. The formation of aldehyde PG acetals may be possible with aldehyde flavors and alcohol constituents from e-liquids.