This phase I trial studies the side effects and best dose of iloprost compared with a placebo in preventing lung cancer in former smokers. Chemoprevention is the use of drugs to keep cancer from forming or coming back. Inhaled iloprost may help prevent lung cancer from forming in patients who used to smoke and who have been found to have abnormal cells in their mucus.
Placebo Administration, Iloprost, Quality-of-Life Assessment, Questionnaire Administration
Cytologic Atypia, Former Smoker, Mild Dysplasia