The battery problem must be down to cheap copies or bad luck...I've had no problems at all. However, there must be some negative impact on health...if I've been on a night out and smoking it hard, next day do have to inhale a bit harder for a breath, nothing really serious though
Anytime you inhale a non-prescribed foreign substance into your lungs you're going to have problems. Not as bad as regular cigs, but do you really know ingredient? Not only that, but extreme heat from burning changes the chemical structure of the substance being burned. That's basic chemistry.
