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Background: Occupational and lifestyle factors, such as smoking and street vending, may pose risks to pulmonary health. Previous studies explored the effect of both smoking and exposure to street pollutants on health. However, a study comparing the pulmonary functions of street vendors (who do not smoke) and smokers has not been conducted before. Objective: The objective of this study was to compare the pulmonary function parameters among three groups consisting of smokers, street vendors and controls in order to discern potential differences in respiratory health between the three groups. Methods: This cross-sectional study was conducted in the Deoghar district of the Jharkhand state, in India, over a period of five months (between January 2023 and May 2023). A total of 90 male participants, including 30 smokers, 30 street vendors and 30 age-matched control research participants, underwent pulmonary function testing (forced spirometry) using standardized methods. The comparison among the three groups was conducted by one-way analysis of variance with the post-hoc test. Results: A total of 30 controls with a mean age of 33.77±6.01 years, street vendors with a mean age of 32.93±6.29 years and smokers with a mean age of 32.27±7.86 years participated in the present study. There was an average exposure to road pollutants for 13.47±9.48 years and smoking for 13.23±8.29 years (P=0.92). Lung function parameters, except for the forced expiratory volume in one second divided by the forced vital capacity (FEV1/FVC), were lower in street vendors and smokers than controls. Conclusion: Street vendors in Deoghar, Jharkhand, have lung function parameters comparable to smokers. Hence, although they are not smoking tobacco, their lung health is at risk. Hence, early interventions are required to protect them from pollutants. [ABSTRACT FROM AUTHOR]