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This is the first line of defense against the invisible irritants that cause harsh throat hits and long-term staining

The researchers note in their paper: "This effect is consistent with the buildup of polymerisation byproducts on or near the coil leading to accumulation of the sort of residues that are often referred to in the blogosphere as 'coil gunk' or 'caramelisation.' Heating these residues would provide a secondary source of volatile aldehydes." Lastly, because many e-cigarettes allow users to control the voltage, the researchers systematically investigated the effect of voltage on emissions

Their smells can be found everywhere from airports to curbside eateries

Medicine and Society Decreasing Smoking but Increasing Stigma