One of the well-publicized causes of lung cancer is smoking cigarettes. Smoking is widely considered the #1 lung cancer risk factor.
One of the reasons lung cancer is so prevalent among smokers is because of the harm smoking causes to the lungs and nearly every major organ on the body, according to the Surgeon General in "The Health Consequences of Smoking: A Report of the Surgeon General, 2004".
After quitting smoking, the lung cancer risk factor decreases. According to many scientists, within hours after smokers inhale that last cigarette, their bodies begin to improve, including a drop in heart rate, improved circulation, and reduction of heart attack, stroke and lung cancer risk factors.
Many smokers believe that smoking was their cause of lung cancer. There are a number of lung cancer causes, including exposure while on the job. If you're an industrial worker, your lung cancer reasons may have been misdiagnosed.
Other causes of lung cancer:
Smoking
Asbestos
Coal mines
Firefighting