What are the primary causes of lung cancer?

The primary causes of lung cancer are well-established, with smoking being the most significant risk factor. Cigarette smoke contains a multitude of carcinogens that damage the DNA in lung cells, leading to mutations and the potential development of cancer. Environmental toxins, such as radon gas, asbestos, and air pollution, also contribute significantly to lung cancer risk. These environmental factors, when combined with smoking, can greatly increase the likelihood of developing lung cancer.

While genetics can influence an individual's susceptibility to developing lung cancer, they are not the sole contributing factor, and excessive exercise does not play a role in causing lung cancer. Airborne allergens may cause respiratory issues and allergies but are not linked to the development of lung cancer in the same way that smoking and environmental toxins are.