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Recent findings suggest that females may be more susceptible than males to the deleterious influence of tobacco smoking in developing chronic obstructive pulmonary disease (COPD). This paper studies the interaction of gender and smoking on development of COPD as assessed by lung function and hospital admission. A total of 13,897 subjects, born after 1920, from two population studies, 9,083 from the Copenhagen City Heart Study (CCHS) and 4,814 from the Glostrup Population Studies (GPS), were followed for 7-16 yrs. Data were linked with information on hospital admissions caused by COPD. Based on cross-sectional data, in the CCHS the estimated excess loss of forced expiratory volume in one second (FEV1) per pack-year of smoking was 7.4 mL in female smokers who inhaled and 6.3 mL in male smokers who inhaled. In the GPS, the corresponding excess loss of FEV1 was 10.5 and 8.4 mL in …