Lung adenocarcinoma is slightly more common in women than in men, and is more likely to occur in younger age group than other types of lung cancer. Smoking is linked to all histologic types of lung cancer, but the strongest association is with squamous cell carcinoma and small cell carcinoma. Adenocarcinoma is the commonest type found in never-smokers. However, due to changes in the design and composition of cigarettes since the 1950s, the risk of adenocarcinoma of the lung from cigarette smoking has also increased. The image shows adenocarcinoma of lung in a 59 y/o male. The gross appearance can simulate bronchopneumonia or tuberculosis due to lepidic growth. Image courtesy: pathorama.ch.