Risking factors of lung cancers

 There are two major risk factors of lung cancer are,

 

•  Smoking                                                            

•   Airpolution 
  
   Smoking

The incidence of lung cancer is strongly correlated with cigarette smoking, with about 90% of lung cancers arising as a result of tobacco use. The risk of lung cancer increases with the number of cigarettes 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. Passive smoking or the inhalation of tobacco smoke by nonsmokers, also is an established risk factor for the development of lung cancer.

          Airpolution

Airpolution 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, and experts  believe that prolonged exposure to highly polluted air can carry a risk for the development of lung cancer similar to that of passive smoking.