I'm new to ecigs, and just ordered a volcano inferno, the new system with the tube tank. I have a few questions about it. First, the kit says it includes a drip tip, is this just an extra accessory or can you use the drip tip with the tube tank? Second, how often do the cartomizers go bad? Or does this just depend on use and keeping it in good condition, etc. Do any of you personally like the tube tank or tank-o-mizer better? I was considering getting the tanko but am not sure yet. Thanks.