Hi, how many years have you smoked? I smoked for 20 yrs. and never coughed up black gunk-mine's always been clear or whitish grey. I've had breathing issues for about 10 yrs now-last 2 have been really bad(shortness of breath). I had an emphysema scare and quit-my x-rays looked like emph, but my pulmonary function test was above normal. Go figure-that scared me enough to quit. I quit in nov. 07'. I strongly suggest that you quit. The black gunk is not good at all. You should get checked out ASAP, and you should get a PFT, and a possible chest x-ray. The x-ray can show emphysema (but only if it's advanced), pneumonia, a mass, and scarring. You need to know where you stand.
Are you having any other symptoms? If I were you, the first time I saw the black mucus I would've quit right then and there.
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