What Causes Lung Cancer?

1. Tobacco smoke

Tobacco smoke is the leading cause of lung cancer worldwide. It contains over 7,000 chemicals, many of which are known carcinogens. These chemicals damage the DNA in lung cells, leading to mutations that can cause cancer.

2. Radon gas

Radon is a radioactive gas that is found in the air and soil. It is the second leading cause of lung cancer in the United States. Radon exposure can occur in homes, workplaces, and other buildings.

3. Asbestos fibers

Asbestos is a mineral that was once widely used in construction materials. Asbestos fibers can be inhaled and become lodged in the lungs, where they can cause damage to DNA and lead to cancer.

4. Air pollution

Air pollution from sources such as traffic, factories, and power plants can contribute to lung cancer risk. Exposure to air pollution can occur both indoors and outdoors.

5. Silica dust

Silica dust is a type of mineral dust that can be inhaled in certain occupations, such as mining, construction, and sandblasting. Silica dust can cause damage to DNA and lead to lung cancer.

6. Diesel exhaust

Diesel exhaust is a type of air pollution that is produced by diesel engines. It contains chemicals that can damage DNA and lead to lung cancer. Exposure to diesel exhaust can occur in workplaces, on the road, and in other settings.

7. Secondhand smoke

Secondhand smoke is the smoke that is exhaled by smokers and then inhaled by nonsmokers. It contains the same harmful chemicals as firsthand smoke and can increase the risk of lung cancer in nonsmokers.

8. Family history of lung cancer

People who have a family history of lung cancer are at an increased risk of developing the disease. This is because certain genetic mutations can be passed down from parents to children that increase the risk of lung cancer.

9. Personal history of lung disease

People who have a personal history of lung disease, such as chronic bronchitis or emphysema, are at an increased risk of developing lung cancer. This is because these conditions can damage the lungs and make them more susceptible to cancer.

10. Age

Lung cancer is more common in older adults. This is because the risk of cancer increases with age.