Interventions to Prevent Lung Cancer other than Smoking Cessation (1990)

Smokers and ex-smokers should be advised to eat foods rich in β-carotene (e.g., carrots) once daily on average. There is no evidence of the effectiveness of physician counselling in inducing dietary changes; however, there is fair evidence to support an increase in β-carotene intake to prevent lung cancer.
There is good evidence to exclude cytologic screening of sputum from the periodic health examination of asymptomatic people. The 1979 recommendation of the task force remains unchanged.