EVERY TIME I SMOKE CIGGERETS I COUGH UP BLACK MUCUS
It means that you are a pretty healthy person except for the smoking; It is your body's way of fighting against contaminants every time you smoke. Your body doesn't like you smoking. Most bodies just accept the toxins, but some after a while always fight against it. Save your body while you can by trying to quit, your mucus coughing has probably saved your lungs a some damage but it's not healthy and can only go on for so long...