http://youtu.be/QKUOYpsbROk There are several different types of lung cancer, such as small cell lung cancer, non-small cell lung cancer, adenocarcinoma, squamous cell carcinoma, large cell carcinoma, and carcinoid . Learn how each type of lung cancer occurs, and how common they are amongst other lung cancers. More free lessons at: http://www.khanacademy.org/video?v=QKUOYpsbROk Practice questions related to these concepts here: https://www.khanacademy.org/test-prep/NCLEX-RN/rn-respiratory-system-diseases/rn-lung-cancer/e/lung-cancer-quiz Find more free videos, practice questions, and articles related to health and medicine, at: https://www.khanacademy.org/science/health-and-medicine Subscribe to Khan Academy Medicine at: http://youtube.com/subscription_center?add_user=khanacademymedicine These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.