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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