I just got my Green Smoke kit last week and was really disappointed at how long the cartos lasted - one carto definitely does not equal a pack of cigs like they said it would! Considering the price of GS cartos I knew I'd have to look into other options. So, I did some research on the forum and found that you can actually refill your GS cartos, even though the end cap isn't removeable. Doctor Vapor has a great video showing 4 different ways of refilling cartos - I've been using the 'condom method' and can't believe how quick, easy, and CHEAP it is! I refill a bunch of empty GS cartos with my favorite
juice in the evening, put the caps on and break 'em out the next day when I need them. You just have to make sure the end that attaches to your battery is totally dry and free of
juice, or you could ruin your automatic battery. I just wad up a paper towel and stick it in the atomizer end and twist it until there's no sign of juice. Check out Doctor Vapor's site, and go to Episode 1 - Cartomizers to watch him fill up cartomizers with juice:
VapeTV | Doctor Vapor