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What are some risk factors associated with contracting lung cancer? 

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Although smoking is the main risk for lung cancer, there are other factors such as environmental pollution or exposure to toxicants that could be associated to this cancer.
Obstructive and restrictive impairments in lung function are associated with increased lung cancer risk.
Of the major risk factors for lung cancer, direct smoking has the greatest influence.
The risk of lung cancer varies widely among smokers.
The identification of risk factors, including obstructive lung disease and familial tendencies to develop lung cancer, may allow for specific strategies that will impact this mortality.
These results suggest that previous lung diseases influence lung cancer risk independently of tobacco use and that these diseases are important for assessing individual risk.
The risk of lung cancer was associated with several occupations and peripheral located tumors and squamous lung cancer was the most common type.
These data provide mechanistic details about why well known risk factors cause lung cancer.
It is highly possible that environmental factors are also responsible for lung cancer cases.

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