I'm totally new to this e-cig culture; I got my first one in the mail 3 days ago and have been enjoying it since. I do have a question though, I received a pack of cartridges with my purchase, and they each have a plastic container that is sealed off; when refilling you must puncture this seal with the cartomizer, how do I go about refilling these cartridges with my own e-liquid? Thanks everyone in advance. Any details would be greatly appreciated.