Hubby bought me a Kensington Power pack to use with my USB passthrough a week or so ago. It works great, and can hold a charge for 2 days. Unfortunately, I just realized that my ecig being connect to the power pack produces a much harsher throat hit. I can barely take a hit off it without choking. Decided to try a regular ecig charged by the charger, and I can smoke it fine. Anyone else have this problem? It sucks because I love that power pack!