I just bought my first e-cig and am really liking it so far. I decided to go with the 808 Volt by smokeless image. I also just ordered some of the Boba's Bounty e-juice. I was wondering if it was absolutely necessary for me to get some blank cartomizers to try out the new juice, or if I could just try it out on a nearly empty pre-filled cartomozer that came with the starter kit. I know it is ideal to have the blank one and that filling a cartomizer with a different type of juice will alter the taste and possibly the vg/pg ratio... but just how bad is it to do this? I mean it wouldn't be dangerous to use two different juices in the same cartomizer would it?