It has been thought that almost all lung cancer has been caused by smoking, however, today we know that there are other factors as well. With smoking, the more tobacco a person has inhaled, the higher the risk. Tobacco smoke contains a number of chemicals that are known to be carcinogenic. Even cigar and pipe smoking can cause a lung malignancy too.
Today there have been cases where a person does not smoke, but have developed cancer of the lung from breathing in second- hand smoke. While inhaling second-hand smoke can be prevented, many non-smokers are exposed to it daily at work, school, and home, and this increases their risk of developing lung cancer by 20-30 percent as stated in an article on women’s health by the Illinois Department of Public Health.
Radon is the second leading cause of lung cancer in the United States. Radon gas is in the ground and can seep through cracks in the foundation of a building or enter through pipes and drains. Radon gas is a radioactive gas that cannot be seen or smelled. There are testing kits for Radon and a wise decision to have homes tested if in doubt of having this gas near you.
Long-term exposure to uranium, arsenic and some petroleum products put people at risk for lung cancer, and people working with asbestos have a higher risk of developing this cancer as well. The environmental air pollution is a cause needed to be explored by scientists.