I was a 2 pack a day smoker a week ago. I am now down to about 1/2 pack a day and loving my Vapor King ecig. My problem is that I do not seem to be getting enough air flow through the device. It seems like I have to suck my brains out to get a hit. It did not seem that way a week ago when I first got it. Does anyone have any idea what I might be doing wrong? Do I need to clean something or what? Does not seem to matter if it is a fresh cart or not. Please help.