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Although Helicobacter pylori (H. pylori) infection has long been associated with many extragastric diseases, its long-term effects on declining lung function and the development of chronic obstructive pulmonary disease (COPD) remains controversial. We conducted a retrospective study in a health screening population (Gene-Environment of Interaction and Phenotype Cohort at Seoul National University Gangnam Health Center in Korea) recruited from 2004 to 2015. The annual decline rates of lung function and the risk for COPD were compared to t