What is the main risk factor identified in many studies for lung cancer?

The main risk factor identified in many studies for lung cancer is smoking tobacco. Numerous epidemiological studies have consistently demonstrated a strong correlation between tobacco use and the development of lung cancer. Smoking is responsible for approximately 85% of all lung cancer cases, making it the most significant preventable cause of the disease.

The harmful substances in tobacco smoke, including more than 7,000 chemicals, many of which are known carcinogens, contribute to the genetic mutations that lead to lung cancer. The more a person smokes and the longer they have smoked, the higher their risk of developing lung cancer. This well-established link between smoking and lung cancer is a critical component of public health campaigns aimed at reducing tobacco use.

While other factors such as exposure to chemicals, a high-fat diet, and genetic predisposition can contribute to the risk of lung cancer, their impact is significantly overshadowed by the effects of smoking.