Circumstances and life style factors that increase a person?s chances of developing a disease are known as risk factors. On the contrary things that prevent disease from developing are called protective factors. Prevention involves increasing protective factors and decreases risk factors. There are various risk factors for lung cancer. Smoking is considered to be a factor that adds to the risk of lung cancer. The risk is also increased for passive smokers who are exposed to tobacco smoke indirectly. It is possible to prevent lung cancer if it is not hereditary. In case there is history of lung cancer in the family, it may not be possible to totally eliminate chances of developing the disease. It is however possible to reduce chances by following an active lifestyle. Regular exercise lowers risks. Additionally, chances of developing lung cancer may reduce if a person consumes low fat diet that is high in fiber content. Treatment of cancer is a painful process for the patient. Treatment