Lung cancer triggers not only because of smoking. A number of carcinogenic substances such as asbestos, arsenic, chromate, nickel, chloromethyl ether, radiation, and pollution also can cause lung cancer.
About 90 percent of cases of lung cancer in men and 70 percent in women are due to smoking habits. The more smoke of cigarettes enter the lung, the greater the risk for lung cancer. The cause is because tobacco smoke contains over 4,000 chemicals, and most are carcinogenic and cause cancer.
Two major carcinogenic substances in cigarette tobacco are nitrosamines and polycyclic aromatic hydrocarbons. However, cigarette is not the only cause of lung cancer.
Many who inhaled substances in the workplace which are carcinogenic. For example, asbestos, arsenic, chromate, nickel, chloromethyl ethers, mustard gas, and coke oven emission and radiation can cause lung cancer.