The objective is to investigate the correlation between smoking pattern and clinical efficacy of EGFR TKIs in male patients with locally advanced or metastasized non-small cell lung cancer of adeno histology who have failed 1st line chemotherapy. Health care resource usage, quality of life (EQ-5D) and practice of EGFR mutation test will also be evaluated. Current practice of EGFR mutation testing in Taiwan will be surveyed.