There are various risk factors which are related to the cancer of lung. The known causes most common are as follows:

Nicotinism.

The nicotinism is probably the bond most closely related to the cancer of developing lung. A person who smokes two packages or more cigarettes per day has that in the possibility seven of the cancer of developing lung. Those which smoke a cigarette pack per day have one twenty-five times greater possibility of cancer of developing lung than a nonsmoker. Moreover, these people who smoke a pipe or a cigar have one five times greater possibility of cancer of developing lung than a nonsmoker.

The risk to develop the cancer of lung increases with the number of cigarettes fume above your life. The nicotinism damages the cells in your lungs. Moment you stop nicotinism, your lungs start to be cured, replacing the cells damaged by the healthy and normal cells. Your risk to develop the cancer of lung starts to decrease almost immediately when you stopped nicotinism. Each year that you do not smoke, your possibilities of fall involute of cancer of lung further. By the fifteenth year, your possibilities of cancer of developing lung are more or less like those of a person who smoked forever.

Smoke of occasion.

Also known like passive smoking, the people exposed to the smoke of occasion systematically will have a larger risk to develop the cancer of lung, even if they are not smoked. The studies proved that those which of phase with a smoker have one 24% greater risk to develop the cancer of lung than the majority of the nonsmokers. The doctors estimate that approximately the 3000 deaths of cancer of lung per year are related to the smoke of occasion.

Asbestos exposure.

The exposure to asbestos is another well-known cause of the cancer of lung and the mesothelioma - cancer of the pleural lining of the lungs. Asbestos was usually employed in the daily construction and products towards the end of the 1800s by the Sixties. Asbestos separates in silica fine the fibres which become imprisoned in fabrics of the lungs. The mesothelioma is inextricably related to the asbestos exposure. It has there no brought back case of mesothelioma in the people who were not exposed to asbestos in the work place or by their environment. A nonsmoker who was exposed to asbestos has one five times larger is likely to develop the cancer of lung than a nonsmoker who was not exposed. The nicotinism increases the risk considerably - a smoker who was exposed to asbestos has a risk to develop the cancer of lung which is 50 to 90 times larger than that of a nonsmoker.

Radon gas one estimates it that approximately 12% of the deaths of cancer of lung can be allotted to radon gas, a gas without color and odourless which is a normal by-product of the weakening of uranium. The Agency for the Environmental protection of the United States estimates that as many of as 15% houses in the United States have not very sure levels of the radon gas, which will explain 15,000 to 22, the 000 deaths of the cancer of lung annually.

The scientists of atmospheric pollution estimate that as much of because 1% of all the deaths of cancer of lung are ascribable to atmospheric pollution. They believe that the exposure prolonged to the very polluted air can raise the risks to develop the cancer of lung approximately with the levels of a passive smoker.