I have lung disease, am i more susceptible for staphylococcal infections?

Hard to tell: I am not sure what lung disease you have. If that affects your immune system (either local or general), you may be susceptible to any type of infection, including staph one. Any structural abnormality of the lungs especially one that precludes good bronchial secretion evacuation seems to be a predisposing factor for lung infection development including staph.

Depends on lung dis: Certain type of lung disorders do increase the risk of developing staphylococcal infections. These include cystic fibrosis, bronchiectasis, copd, primary ciliary dyskinesia etc. All these conditions are associated with impairment of clearance of secretions from the lungs that allow bacteria to multiply in these retained secretions thereby increasing risk of active infection with staphylococcus.

Why: Poor teeth? Recent hospitalization? Alcohol? Exposure to staph? Usually not increased.