Lung cancer is a form of very rapid development of the cells (abnormal) in lung tissue caused by changes in tissue form cells or expansion of the cells themselves. If left unchecked this abnormal growth can spread to other organs, both near and far to the lung such as bone, liver, or brain.
Lung cancer caused by smoking more (87%), while the rest are caused by the substance asbestos, radiation, arsenic, chromate, nickel, chloromethyl ethers, mustard gas and coke oven emissions can cause lung cancer, although usually only occurs in workers who also smoke.