The commonest would be tumour. At this age a benign tumour would be most likely, but in a smoker with hemoptysis a malignancy must be considered. Occasionally symptoms are related to the hormonal substances produced in these cells resulting in the carcinoid syndrome . Presentation is usually in patients under 40 years of age. They differ in that the latter are highly malignant and are strongly related to cigarette smoking.
Carcinoids are of low grade malignancy and have no relationship to cigarette smoking.