what can go bad on these tanks besides the coil. Bought a brand new one two weeks ago was letting the juice I bought it for steep filled it up let the coils soak for 15 min and does not produce any vapor at all thought the stock coil was bad so replaced it with a new coil. Same thing no vapor no hit nothing. Thought the juice might be bad so dumped it replaced it with a juice I have been vaping for a month same thing. I thought the only part to these tanks was the coil and the rest of it just held the liquid but it looks like Ive got one thats doa has 4 other aro 2 tanks that work like a champ.