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Wiring them in parallel keeps the voltage correct

This is confirmed by scientific research

Featuring heavy-duty 16AWG copper wire, an inline safety fuse, and a metal-reinforced cigarette lighter plug, the ICECO 12V DC Power Cable w/ Cigarette Lighter Plug delivers reliable 12V DC power from any vehicle cigarette lighter or 12V accessory outlet

You'll find that the draw is quiet for more discreet vaping

Another concern is that metal absorption is markedly higher through inhalation, as compared with ingestion, and that while some of the metals found in e-cigarette aerosol are essential elements when ingested (zinc, manganese, copper, and chromium[III]), exposure to these metals through inhalation tends to be toxic (Goyer and Lavoie, 2001