 Lung cancer in people who have never smoked is almost universally NSCLC, with a sizeable majority being adenocarcinoma.On relatively rare occasions, malignant lung tumors are found to contain components of both SCLC and NSCLC.In these cases, the tumors are classified as combined small cell lung carcinoma (c-SCLC), and are (usually) treated like "pure" SCLC.