一项美国成年人参与的“癌症预防Ⅱ”的前瞻性队列研究发现,抽吸焦油含量很低或低或中度含量的过滤嘴纸烟的吸烟者其罹患肺癌的风险几乎无明显差异。美国麻省理工学院(MIT)的 Jeffrey E Harris 教授及其同事报道说,通过闭住气孔、增加吸气体积 A prospective cohort study of “American Cancer Prevention II” by a U.S. adult found that smokers who smoke tipped cigarettes with very low or low titers of tar had almost no difference in the risk of developing lung cancer. Prof. Jeffrey E Harris and colleagues at the Massachusetts Institute of Technology (MIT) reported that by closing the stoma and increasing the inspiratory volume