Smoking is the topmost cause that can lead to lung cancer. Tobacco and other substances that can cause harm to your lungs can hasten the process of abnormal cell growth. Many people develop lung cancer from secondhand smoke as well.
2. Genetic changes
It is important to note that people who are not exposed to first or secondhand smoking can also develop lung cancer. This is due to genetic changes in the body that can result in tumors and unchecked cell growth. Some people may not have inherited the ability to break down certain chemicals in the body, thus potentially increasing the risk of getting cancer.
3. Exposure to carcinogenic fumes
Environmental factors can cause lung cancer. Exposure to toxic fumes and carcinogenic substances can add to the risks as well. Especially asbestos and high exposure to exhaust fumes from diesel-powered vehicles and pollution.