The American Lung Association notes lung cancer as the leading cancer killer among men and women. Cancer of the lung(s) is caused by abnormal cellular proliferation. The rapid growth of cancerous cells can form tumors and metastasize (spread) to other organs in the body. Treatment options vary depending on the stage of cancer and the individual’s health needs. Early screening and health promotion are imperative for lung cancer control and prevention. The Mayo Clinic also comments on risk factors leading to lung cancer stating, “The risk of lung cancer increases with the length of time and number of cigarettes you've smoked. If you quit smoking, even after smoking for many years, you can significantly reduce your chances of developing lung cancer.”