That does seem to be the nature of it - it certainly goes through juice faster than other carto's I've used so far. You just can't get warm & tasty plumes of vapor without going through the juice needed to produce them I guess. I've been using them either on my 14500 batteries that have been in use half the day already, or on basic 901 batts so that they aren't quite as potent. Another thing that seems to be happening is that the filling becomes saturated or something (less able to hold as much fluid or feed the fluid it's "holding") but I think that's normal with carto's anyway (note that I'm not all that experienced either - it's just been a few months now). So, I've had to add much less fluid, much more often or else it starts gurgling or tasting like acetone or something if I don't pay attention and let it get too dry.