I've been vaping now for three weeks, and aside from once last week, when curiosity had me smoke one cigarette just to see if I was over them (I am. It tasted like burning tire rubber in a junk yard), I've been cigarette free since. Thing is, over the weekend I started coughing up some really nasty stuff. Black phlem to be specific. I've been doing some reading, and apparently this is normal for those who just quit smoking. It's wild, what I was doing to my lungs for 16 years.... Anyway, I was wondering if any other recently quit smokers have experienced this. Also, if anyone has has such a delayed response. As I said, it's been 3 weeks, and only NOW is this happening to me.