Three common respiratory diseases seem to be associated with an increased risk of lung cancer, researchers report.

The investigators analyzed data from seven studies that included more than 25,000 people and found that chronic bronchitis, emphysema and pneumonia were linked with a greater risk of developing lung cancer.

Having asthma or tuberculosis was not associated with a higher lung cancer risk, according to the study published in the Aug. 15 issue of the American Journal of Respiratory and Critical Care Medicine.

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