Prevention is Better than Cure
Cigarette smoking is a major cause of lung cancer. It also poses a threat to non smokers who inhale the so-called second hand smoke.
If you want to prevent having lung cancer (and other types like mouth, pharynx, larynx, esophagus), do not smoke-quit smoking cigarettes or tobaccos. If you quit smoking, you will reduce your chances of having cancer. If you are a non-smoker, stay away from smokers so as not to be exposed to the harmful secondhand smoke.
If you suspect that you might have or at risk of having lung cancer, consult your doctor. He can schedule you for a series of screenings and examinations like chest x-rays, blood and sputum tests, CT scans, and tissue biopsy.
Your doctor or health care team can explain whatever the results and the possible treatments and medications available for you.