Who is most at risk
Smoking is by far the leading risk factor for lung cancer. Tobacco smoke causes more than 8 out of 10 cases of lung cancer. The longer a person has been smoking and the more packs per day smoked, the greater the risk. If a person stops smoking before lung cancer develops, the lung tissue slowly returns to normal. Stopping smoking at any age lowers the risk of lung cancer. Cigar and pipe smoking are almost as likely to cause lung cancer as is cigarette smoking. There is no evidence that smoking low tar cigarettes reduces the risk of lung cancer. People who donít smoke but who breathe the smoke of others also have a higher risk of lung cancer. Non-smoking spouses of smokers, for example, have a 30% greater risk of developing lung cancer than do spouses of nonsmokers. Workers exposed to tobacco smoke in the workplace are also more likely to get lung cancer.
Asbestos is another risk factor for lung cancer. People who work with asbestos have a higher risk of getting lung cancer. If they smoke as well, the risk is greatly increased. Although asbestos was used for many years, the government has now nearly stopped its use in the workplace and in home products. While it is still present in many buildings, it is not thought to be harmful as long as it is not released into the air.
Radon is a radioactive gas made by the natural breakdown of uranium, which is found at higher than normal levels in the soil in some parts of the US. Radon canít be seen, tasted, or smelled. Radon can become concentrated indoors and create a possible risk for cancer. Smokers are especially sensitive to the effects of radon. State and local offices of the EPA (Environmental Protection Agency) can provide information about how to test for radon in the home. High radon levels in some mines can increase the lung cancer risk for miners.
Radiation treatment to the lung: People who have had radiation to the chest to treat cancer are at higher risk for lung cancer, especially if they smoke.
Other diseases such as tuberculosis (TB) and some types of pneumonia often leave scars on the lung. This scarring can increase the risk of developing lung cancer. People with diseases from breathing in certain minerals also have a higher risk of lung cancer.
Cancer-causing agents in the workplace include the following:
∑ Nickel chromates
∑ Coal products
∑ Mustard gas
∑ Chloromethyl ethers
∑ Diesel exhaust
People who work with these substances should be very careful to avoid exposure as much as possible.
Personal and family history: If you have had lung cancer, you have a higher risk of getting another lung cancer. Brothers, sisters, and children of people who have had lung cancer may have a slightly higher risk themselves.
Diet: Some reports suggest that a diet low in fruits and vegetables might increase the risk of lung cancer in people who are exposed to tobacco smoke. It may turn out that fruits and vegetables help protect against lung cancer.
Air pollution: In some cities, air pollution may slightly increase the risk of lung cancer. But the risk is still far less than that caused by smoking.
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