Hi everyone! I've been using e-cigs since December 2nd! I love them and I haven't looked back. Now I'm buying one for my friend. Thing is, the chargers on truesmoker is sold out of the traditional usb chargers. How does the passthrough work?? Can it replace a charger?? I've been trying to figure out what the passthrough is exactly, but can't find any info. Thank you!! 