Top Causes Of Lung Cancer
The major causes for the development of lung cancers are as follows:
Cigarette Smoking
Smoking is the major cause of lung cancer. About 90 percent of cases of lung cancer are associated with cigarette smoking. The chances of having lung cancer increased by increasing the number of cigarettes smoked over time. The doctors measure the pack-years of a person’s history. This pack-years of smoking history measured by multiplying the number of packs smoked per day by years. If a person used to smoke two packs each day for two years has a history of 20 pack-year. The individuals having 30 pack-year of smoking history has the highest risk of lung cancer. The cigarette smoker has 25 times more risk of lung cancer than the person who does not smoke.