During my last 3-6 months of smoking prior to quitting, i was coughing up brown
. It was a daily occurance, quite often, almost every time i smoked and would cough. After i quit smoking, the amount of dark mucus declined substantially and almost dissapeared for the past 3 months or so. However recently, the dark phlegm has returned. Not much, but maybe a bad/nasty bout of it every 2-4 days. I don't cough often at all, and when i do cough, i usually do cough up that dark mucus.