The most severe threat to mankind is mankind itself; cigarettes, alcohol, and other .
man made drugs relate to an enormous percentage of unnatural deaths recorded each .
year. One of the most common and most deadly advocates to this is Lung Cancer, which .
accounts for one third of all cancer deaths in the United States. Over 90% of lung cancer .
patients are smokers, and about 3000 people will die this year due to secondhand .
smoking most of who have never smoked a cigarette in his or her lives. .
The physical cause of lung cancer is associated with harmful toxins (carcinogens) .
in tobacco smoke, exposure to asbestos, radioactive dust, and Radon which damages the .
cells in the lungs. Over time these damaged cells could develop into lung cancer. Usually .
cilia (tiny hair like projections on cell surfaces) can clean most toxins which are breathed .
in, unfortunately smoking eventually overwhelms these structures barring them useless. .
As lung cancer grows, it may spread to the lymph nodes or other tissues in the chest, .
including the other lung. Lung cancer is classified in stages that are determined by the .
size of the malignant tumor and how far the cancer has spread within the lung, to nearby .
tissues, and to other organs. .
Like many cancers early detection is the best chance for a full recovery, however .
like many cancers the early stages of lung cancer may show no symptoms. In the .
advanced stages of lung cancer symptoms become very reveling and persistent. A new .
cough or a cough that does not go away, smokers may have a chronic cough from .
smoking, but a change in the frequency or severity of their cough may occur. Chest, .
shoulder, or back pain that doesn't go away and often is made worse by deep breathing. .
At some point, lung cancer will usually spread (metastasize) to other parts of the body . .
The most common sites are the bones, the brain, the liver, the other lung, and the adrenal .
glands. When lung cancer metastasizes(spreads), the following symptoms may also .