Smoking Cigarette smoking is one of the main reasons of lung cancer. 90% of the cancers have been caused by use of tobacco. Tobacco smoke contains over 4,000 chemical compounds, many of which have been shown to be cancer-causing or carcinogenic. The two primary carcinogens in tobacco smoke are chemicals known as nitrosamines and polycyclic aromatic hydrocarbons. The risk of developing lung cancer decreases each year following smoking cessation as normal cells grow and replace damaged cells in the lung. In former smokers, the risk of developing lung cancer begins to approach that of a nonsmoker about 15 years after cessation of smoking.
Passive smoking Passive smoking otherwise known as second hand smoking is also an establishment risk factor for development of lung cancer. Researchers have proved that over the course that passive smokers who reside with smokers have a 24% increase in risk for developing lung cancer. It is reported that an estimate of 3000 people die of lung cancer each year in US.
Asbestos fibers Asbestos is known to be a cause of lung cancer and other types of cancer. The asbestos fibers can become airborne and get in your lungs. The workplace is a common source of exposure to asbestos fibers. Today, asbestos use is limited or banned in many countries. Often the cancer doesn’t show up until decades after exposure.
Radon gas Radon gas, which occurs naturally in rocks and soil in certain areas, may cause lung damage and may eventually result in lung cancer if it seeps into your home. The presence of radon in the home can be measured using an inexpensive kit that can be purchased at department or hardware stores.
Prior history of lung cancer Survivors of lung cancer have a greater risk of developing a second lung cancer than the general population has of developing a first lung cancer.
Air pollution Air pollution from vehicles, industry, and power plants can raise the likelihood of developing lung cancer in exposed individuals. Up to 1% of lung cancer deaths are attributable to breathing polluted air.
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