I've been smoking for over 5 years now, and the rate has been inconsistent. I have smoked more than 10 cig per day during exams in college, and at home I smoke 1 cig per day. Recently, I caught cold and cough, and Lot Lot of mucus is coming out while coughing and clearing nose. But, the coughs are getting painful and irritating. Seems like, Instead of healing my lungs, it has given up on healing because of the tar that's already there. I'm scared, is that a sign for cancer? What can I do to heal properly (not the obv ans of quitting, which I am on already). How to get any better and live healthy?