"The fact that lung and non-lung cancer death rates are almost perfectly associated means that smokers and nonsmokers alike should do what they can to avoid tobacco smoke," explains Bruce Leistikow an adjunct professor of public health sciences at the University of California, Davis. For more information about Quit Smoking Hypnosis, you can check out via the web.
"It also suggests that increased attention should be paid to smoking prevention in health care reforms and health promotion campaigns." The reason smoking causes lung cancer (and perhaps other cancers too) is that the smoke itself has carcinogenic chemicals in it.
As these chemicals are put into the lungs, year after year, they cause damage to the DNA that combines with oxidative stress and inflammation to promote both the start and growth of tumors.
The DNA damage, and the inability of the body to fix it is what cause malignancy, i.e. cancer.
Because lung cancer in its early stages is difficult to detect and presents with virtually no symptoms, by the time the disease is found it's typically advanced. The five-year survival rate for lung cancer is 15% – certainly not a good number.
This is why the medical community is so adamant about keeping people from smoking in the first place or helping smokers to quit. If you stop smoking, your chances of lung cancer go down steadily as the damage to your lungs is repaired and contaminating particles are gradually removed from the lung tissue.