Before the start of 20th century lung cancer cases were rare (0.5%). In year 2018 alone 21 lakh new cases of lung cancers were diagnosed with around 18 lakh death because of lung cancer. Smoking is the main risk factor for developement of lung cancer. Good thing is Smoking is completely avoidable risk factor. Know all details of Lung cancer symptoms, treatment and prevention. Contact Thoracic oncologist Dr Jaipalreddy Pune