Smoking is commonly regarded as the primary cause of lung cancer in patients. However, it may also occur in people who do not smoke. Other causes of lung cancer may include air pollutants, heredity and genetics as well as passive smoking. For more insights, refer to DocTube™. https://doctube.com/watch/major-causes-of-lung-cancer-in-non-smokers_4T2Y2MCzSyoTtth.html