After a couple years of no smoking, no coughs, etc., I relapsed at Christmas and immediately began having a heavily irritated chest, like an infection. It felt like I was inhaling fibreglass. I finally quit a couple weeks ago, and the coughing is MUCH better, but I'm still irritated down there, so much so that even walking by a candle can start me coughing. Is this normal? I smoked for many years and hardly ever coughed.