Sometime the coughing may bring up black sputum (mucus). If you or someone close to you developed black lung after using a 3M dust mask, you may benefit from participating in a free 3M dust mask lawsuit investigation. Interstitial lung disease (ILD) is a category of chronic lung conditions that affect the interstitium. It also damages your air sacs, thereby impeding oxygen from being exchanged with carbon dioxide. This thickened, stiff tissue makes it more difficult for your lungs to work properly. In early stages, the most common symptoms are cough, shortness of breath and chest tightness. Lung Cancer Life Expectancy: The lung cancer survival rates by stage - As mentioned above, survival rates do not reflect differences in individuals.