Lung Cancer: What is it?

Lung cancer usually begins to form in the mid-fifties or sixties. Smoking is responsible for 80% to 90% of cases of lung cancer.This cancer is particularly threatening because it can easily spread to the rest of the body than other types of cancer. Indeed, all the blood through the lungs to be oxygenated, and lungs are in close contact with several blood and lymph vessels. Lung cancer is even