Which lifestyle factor is primarily responsible for lung cancer?

Smoking is the primary lifestyle factor associated with lung cancer, accounting for approximately 85% of all cases. The harmful chemicals in tobacco smoke, including carcinogens, lead to mutations in lung cells, increasing the risk of tumor development. This strong correlation is well-documented through extensive research showing that smokers are significantly more likely to develop lung cancer compared to non-smokers.

While other factors like genetics, poor diet, and obesity may have varied influences on overall health and even certain types of cancer, it is the act of smoking that has been most clearly linked to the vast majority of lung cancer cases. For instance, although genetics can predispose individuals to certain health conditions, the significant exacerbation of risk from smoking solidifies it as the leading cause of lung cancer.