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目的目前对肺气肿的演变所知甚少,对肺气肿的演变与吸烟习惯的关系的了解也较少。本研究通过评价无症状的超过2年的目前吸烟和既往吸烟者的肺气肿进展情况,研究
Objectives Little is known about the evolution of emphysema and little is known about the relationship between the evolution of emphysema and smoking habits. This study evaluated the progress of emphysema in current asymptomatic smokers and former smokers over two years,