. The lung cancer has many causes. Firstly, smoking is major cause of lung cancer such as cigarette. Smoke from cigarette will destroy lung tissues which cannot working normal. Second, the asbestos is substance which is used in industrial such as cement industry, plastic industry and paper industry etc. When person at worker in these industries may be inhalation of asbestos, this substance accumulate in lung which can lead to lung cancer. Moreover, if smoking combine asbestos can result in lung cancer rapidly. Finally, another causes such as air pollution and inherited genetic can lead to lung cancer. For example, some person may get smoke from cars or industries which may get long time of air pollution. Resulting, the high toxin accumulate in lung can lead to lung cancer