What is the most common cause of lung cancer?

Smoking is the most common cause of lung cancer and has been well documented through extensive research. The carcinogenic compounds in tobacco smoke lead to mutations in the DNA of lung cells, promoting the development of cancer over time. It accounts for the majority of lung cancer cases, with an estimated 85% of lung cancer deaths attributed to this habit.

Additionally, the effects of smoking are dose-dependent, meaning that the more a person smokes, the greater their risk of developing lung cancer. This risk persists even after quitting smoking, although it gradually decreases over time.

While asbestosis, radon exposure, and passive smoke exposure are notable risk factors for lung cancer, they occur far less frequently compared to smoking. Asbestosis is linked to occupational exposure to asbestos, which has seen a decline in prevalence due to regulatory measures. Radon, a naturally occurring radioactive gas, is also recognized as a risk factor, particularly in locations with poorer ventilation, but its impact is minuscule compared to the high prevalence of smoking. Passive smoke exposure, while harmful and a known risk factor, affects a smaller population when compared to the extensive impact of smoking among active smokers.