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ETS暴露是指非吸烟者暴露在吸烟者于各种环境中吸烟所产生的香烟烟雾。许多研究主要是流行病学研究报告显示ETS暴露与上述两种疾病间存在着微弱但统计学上有显著意义的联系，而另外一些研究则未能显示ETS暴露与上述两种疾病的联系。这两种截然不同的结果产生的原因：首先，ETS
ETS exposure refers to exposure of non-smokers to cigarette smoke produced by smokers in various settings. Much of the research is largely based on epidemiological studies that show a weak but statistically significant association between ETS exposure and the above two diseases, while others have failed to show the link between ETS exposure and the above two diseases. The reason for the two very different results: First, ETS