PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Not specified Cardiovascular: No history of severe hypertension, i.e.: Systolic 200 mm Hg or more Diastolic 120 mm Hg or more No MI within 6 weeks Pulmonary: Available for annual sputum induction and clinical evaluation Clinically able to undergo pulmonary function tests (PFTs) and bronchoscopy Refusal of PFTs or bronchoscopy will not effect eligibility PFTs waived if FEV1/FVC < 65% on prior testing No acute respiratory infection Other: No prior uncontrolled malignancy except nonmelanomatous skin cancer Exceptions for malignancy controlled more than 5 years discretionary