The prognostic impact of the amount of tobacco smoking in non-small cell lung cancer-Differences between adenocarcinoma and squamous cell carcinoma

The never-smokers had a significantly better prognosis than ever-smokers among Ad patients, whereas the light-smokers had a significantly worse prognosis than heavy smokers among Sq patients. There may be factors other than tobacco carcinogens that influence the development of Sq in never and/or light smokers.