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The sustained high prevalence of smoking in China has contributed substantially to the burden of chronic diseases, including respiratory diseases. This study compared the prevalence of smoking and respiratory diseases in Chinese adults between two time periods spanning over 25 years. Cross-sectional surveys were performed in four Chinese cities of Chongqing, Lanzhou, Wuhan, and Guangzhou in 1993-1996 (Period 1) and in 2017-2018 (Period 2). Participants completed questionnaires asking smoking status, the presence of asthma and chronic br
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