In the Lung Health Study I, to determine the effects of Special Care, compared to Usual Care,
on rate of decline in pulmonary function in a group of cigarette smokers identified as having
mild abnormalities in pulmonary function.
In the Lung Health Study III, to determine the long-term effects of smoking cessation and
continued smoking, on cardiopulmonary morbidity, mortality, and the rate of decline in the
one second forced expiratory volume (FEV1) in men and women with early chronic obstructive
lung disease who have been followed prospectively for 12 to 15 years.