OBJECTIVES: I. Evaluate whether immunostaining of induced sputum specimens improves the sensitivity and specificity of routine morphologic sputum surveillance to detect second primary lung cancer in patients with previously resected nonsmall cell lung cancer. II. Evaluate which patients are at risk of developing a second primary lung cancer by immunostaining specimens from patients with no morphologic atypia on routine Papanicolaou cytology. III. Make available archived sputum samples and bronchial washings for further analysis of new antibodies and techniques. IV. Evaluate whether analysis of elevations of relevant growth factors in bronchial lavage fluid from patients with positive immunostaining or morphologic atypia increases the accuracy of early detection. V. Evaluate whether quantitation of shed antigens in sputum increases the accuracy of early detection. VI. Evaluate whether the extent of airway obstruction, as measured by the forced expiratory volume, can predict an increased risk of developing lung cancer.