According to the American Cancer Society, lung cancer is the number one cancer killer in America, taking more lives each year than breast, prostate and colon cancers combined. It is the leading cause of cancer death among women in the United States, surpassing the dreaded breast cancer.

The most common cause of lung cancer is long term exposure to tobacco smoke. Three to five years after quitting, the risk of getting lung cancer is reduced by half. For smokers the risk is significant due to the synergistic effects of radon and smoking as well as asbestos exposure.

As dirt and smoke chemicals build up in your lungs, you have a higher change of getting 肺癌成因. Even non-smokers are not spared. People who constantly inhale secondhand smoke will also be likely to develop lung cancer.

Overall, this type of cancer is one of the most difficult cancers to treat and it is no wonder that it is the major cause of cancer death in the world. Lung cancer can generally be categorized as small cell cancer and non-small cancer. Non-small cell cancer is more common while small cell cancer is harder to treat because it generally spreads faster.