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He said that without intervention, PM2.5, a major cause of choking smog, would replace smoking tobacco as the top risk factor for lung cancer. 他表示，如果不采取任何措施的话，造成令人窒息的浓雾的主要因素之一——PM2.5将会取代吸烟，成为诱发肺癌的首要因素。