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Electronic cigarettes (e-cigarettes) generate an aerosol by heating a solution (e-liquid) with a metallic coil. Whether metals are transferred from the coil to the aerosol is unknown.

Our goal was to investigate the transfer of metals from the heating coil to the e-liquid in the e-cigarette tank and the generated aerosol.

We sampled 56 e-cigarette devices from daily e-cigarette users and obtained samples from the refilling dispenser, aerosol, and remaining e-liquid in the tank. Aerosol liquid was collected via deposition of aerosol droplets in a series of conical pipette tips. Metals were reported as mass fractions () in liquids and converted to mass concentrations () for aerosols.

Median metal concentrations () were higher in samples from the aerosol and tank vs. the dispenser (all ): 16.3 and 31.2 vs. 10.9 for Al; 8.38 and 55.4 vs. for Cr; 68.4 and 233 vs. 2.03 for …