 -- No serious, symptomatic obstructive or emphysematous lung disease, or asthma requiring intravenous medications within the past 12 months; no serious lung disease associated with dyspnea at normal activity levels grade III or at rest grade IV, due to any cause including cancer metastases and pleural effusions. The patient will be ineligible if PFTs show an FEV1 1.3 liters or a DLCO 50 within 12 weeks of study entry. 