How Smoking Increases the Risk of Lung Cancer?
https://www.manipalhospitals.com/goa/blog/how-smoking-increases-the-risk-of-lung-cancer/
When any individual inhales tobacco smoke, different chemicals enter the human lungs, which damages the DNA of the lungs. The human body has evolved a mechanism for repairing the damaged DNA, but smoking in individuals may cause even more damage to the body. This further results in the formation of cancer cells. The inhalation of tobacco smoke tends to damage the small air sacs, known as alveoli, in the lungs. These alveoli are responsible for respiration. Damage to these alveoli in the lungs leads to chronic obstructive pulmonary disease, affecting the lungs and, later, if not treated, results in causing lung cancer.