Okay, this is strange to say the least. I'm currently working on one of my prefilled cartos from the premium menthol samplers pack. (BTW, combined with my new black manual and it's green LED, my e-cig looks totally cool! 
) Anyway, at some random point during inhale the carto will make a single popping noise. I would equate the noise and tone with someone gently (if that makes any sense) snapping a rubber band, or maybe one of those snap and pops we used to play with as kids, but not as loud. I would estimate that it's somewhere around 5X the normal sound of heating liquid on a manual. There seems to be no rhyme or reason to it, it might happen 2 seconds into the draw, could be 4. All I do know is that it's rather disconcerting. I tried the battery on other cartos, just to make sure that wasn't the culprit, and it's definitely this particular carto. Has anyone else had this happen to them? Any ideas as to what it could be? Otherwise the cart seems to be acting normally, good vapor production, etc. Should I chuck it, or hope that it's just being weird? 
) Anyway, at some random point during inhale the carto will make a single popping noise. I would equate the noise and tone with someone gently (if that makes any sense) snapping a rubber band, or maybe one of those snap and pops we used to play with as kids, but not as loud. I would estimate that it's somewhere around 5X the normal sound of heating liquid on a manual. There seems to be no rhyme or reason to it, it might happen 2 seconds into the draw, could be 4. All I do know is that it's rather disconcerting. I tried the battery on other cartos, just to make sure that wasn't the culprit, and it's definitely this particular carto. Has anyone else had this happen to them? Any ideas as to what it could be? Otherwise the cart seems to be acting normally, good vapor production, etc. Should I chuck it, or hope that it's just being weird? 
