title: Letter: Smoking and lung cancer.
mesh_terms: D006801:Humans; D007111:Immunity, Cellular; D007165:Immunosuppression Therapy; D008175:Lung Neoplasms / Q000209:etiology* / Q000235:genetics / Q000276:immunology; D008213:Lymphocyte Activation; D012737:Sex Factors; D012907:Smoking