Black mucus can materialise after inhaling dirt or dust; or after smoking cigarettes. It can also signal a serious fungal infection, especially if you have a compromised immune system. If your ...

The extra mucus also increases your risk for respiratory ... Lungs damaged due to smoking are black or gray, inflated, and inflamed. The diaphragm of a smoker with lung damage will show muscle ...

However, persistent problems with excess mucus, frequent coughing, or a feeling that something is interfering with breathing require medical diagnosis and treatment. When a person quits smoking ...