主动吸烟使肺癌发病率增高的观点,已被人们所普遍接受。多年来,尽管禁烟呼声四起,但吸烟状况并无改善,在火车、地铁、渡轮、候车室、商场、办公室等公共场所,甚至在家庭居室,纸烟烟雾已构成这些室内的主要污染来源。近年来,人们已经逐渐地意识到,被动吸烟有多种危害,而且国 The idea that active smoking increases the incidence of lung cancer has been widely accepted by people. Over the years, despite repeated calls for non-smokers, smoking has not improved. In public places such as trains, subways, ferries, waiting rooms, shopping malls, offices, and even in family homes, cigarette smoke has constituted these major sources of indoor pollution. In recent years, people have gradually realized that passive smoking has multiple hazards and