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Understanding Sputum and What the Different Colors Mean Smoking marijuana may be tied to cough, sputum production Change in phlegm production, pulmonary function, and smoking habits of Download Table While occasional brown phlegm can be harmless, it should not be ignored, especially if it keeps coming back or is getting worse. Smoking can seriously damage your lungs. It causes mucus buildup, tar deposits, and inflammation, making the lungs larger than normal and harder to function. Healthy lungs are pink, clean, and inflammation free. Don't Why Is My Mucus Brown?
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