how do you tell if a vapage cartomizer or attomizer are dead? i have been using the same cartomizer for about 3 weeks with the same flavor(spearmint) and today it seems like its losing flavor. i have used the attomizer every now and again also and i love that thing but the price is a bit ridiculous in my opinion. so how do i know when they are done? also curious about other great cartos and attys that other venders sell. thanks