Been checking out litecigusa.net and liberty flights for a 510 cartomizer, a few questions,,should I get pre-filled or empty? Arent they both re-fillable ? What is a boge soft cap ? I understand I need a standard resistence cartomizer,, NOT a low resistence, to be compatable with my 510 battery, , so what is a low resitence carto for ? How long does a cartomizer last if you refill it,? Is it disposable after a while ?? Do vapers usually toss their cartridge and atomizer once they get into cartomizers?? also what is a mod ?? any other site you suggest for cartos? thanks as always for the help ,keep on vapin'