I've been coughing this up for years but now it is real thick and black smells like sulfur. I quit smoking a few weeks ago could that have something to do with it?
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I congratulate you for quitting smoking. It sounds like the cilia inside your bronchioles are beginning to function normally again, removing harmful cigarette residues to the outside as mucus. You will continue to cough up dark phlegm until your lungs are clear.
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