Inhaling tobacco smoke probably causes at least 90% of all lung cancer. Smokers have more than 30 times the risk of nonsmokers. See that as you want (my dear smokers) but that is a fact. A person's risk for lung cancer depends on how many packs of cigarettes the person smokes each day and for how many years. People who quit smoking remain at risk, sometimes for decades. People exposed to radiation, radon, asbestos, and probably heavy metal are also at risk.
Lung cancer occurs if the cells lining the airways of the lungs are constantly exposed and stimulated by cancer-causing substances over several decades. This changes the genetic DNA, makeup of cells and results in the uncontrollable growth of abnormal cells.
It is very rare for a person who has not been exposed to cigarette smoke or radiation to develop small cell lung cancer. It occurs most often in middle aged and elderly people who have been exposed to cancer-causing poisons for several decades.
0 comments:
Post a Comment