I am in my first week of vaping. I decided that in order to try alot of different flavors, i wanted to use the cartomizers & basically use one for each flavor. So, my silly question is for those of you that use several cartomizers, how do you mark them or tag them to see which one it is. I was also wondering what is the average life span of a cartomizer? I want to make sure i dont run out so i dont have to revert to analogs while waiting on replacements....