癌症患者死因排序中肺癌居首位。吸烟是引发肺癌的最主要的危险因素,肺癌患者中90%为中重度吸烟者,因此戒烟成了预防肺癌的主要措施。尽管戒烟降低了肺癌的发生,但是曾经吸烟的人患肺癌的危险性仍高于从未吸烟者[1]。目前诊断为非小细胞肺癌(non-sm all cell lungcancer,NSCLC) Cancer patients ranked first in the ranks of causes of lung cancer. Smoking is the most important risk factor for lung cancer. 90% of lung cancer patients are moderate-to-severe smokers. Therefore, smoking cessation has become the major measure to prevent lung cancer. Although smoking cessation reduces the incidence of lung cancer, those who smoke have a higher risk of developing lung cancer than those who never smoked [1]. Currently diagnosed as non-small cell lung cancer (non-sm all cell lung cancer, NSCLC)