Lung cancer is the deadliest type of cancer for both men and women. Each year, more people die of lung cancer than breast, colon, and prostate cancers combined.
Lung cancer is more common in older adults. It is rare in people under age 45.
Cigarette smoking is the leading cause of lung cancer.
The more cigarettes you smoke per day and the earlier you started smoking, the greater your risk of lung cancer. There is no evidence that smoking low-tar cigarettes lowers the risk.
However, lung cancer has occurred in people who have never smoked.
Secondhand smoke (breathing the smoke of others) increases your risk of lung cancer. According to the American Cancer Society, an estimated 3,000 nonsmoking adults will die each year from lung cancer related to breathing secondhand smoke.
The following may also increase one's risk of lung cancer:
- High levels of air pollution
- High levels of arsenic in drinking water
- Radon gas
- Family history of lung cancer
- Radiation therapy to the lungs
- Exposure to cancer-causing chemicals such as uranium, beryllium, vinyl chloride, nickel chromates, coal products, mustard gas, chloromethyl ethers, gasoline, and diesel exhaust
Early lung cancer may not cause any symptoms. Many times, lung cancer is found when an x-ray is done for another reason.
Symptoms depend on the specific type of cancer you have, but may include: