Rationale Smoking is a primary risk

Rationale Smoking is a primary risk factor for chronic bronchitis, emphysema, and chronic obstructive pulmonary disease, but since not all smokers develop disease, it has been suggested that some individuals may be more susceptible to exogenous factors, such as smoking, and that this susceptibility could be genetically determined.

結果 (中文) 1:

理由吸烟是慢性支气管炎、 肺气肿和慢性阻塞性肺病的风险因素，但因为不是所有的吸烟者患疾病，它提出了一些个人可能会更容易受到外来因素，如吸烟，和这种易感性可能由遗传基因决定。

結果 (中文) 3:

依据吸烟是慢性支气管炎，肺气肿的主要危险因素，与慢性阻塞性肺疾病，但是并不是所有的吸烟者发展为疾病，它已经表明，一些人可能更容易受到外源性因素，如吸烟，这种敏感性可能是由基因决定的。