Pirfenidone is InterMune's investigational drug candidate for the treatment of patients with idiopathic pulmonary fibrosis to reduce decline in lung function.

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While the risk reduction is relatively small, 10 percent, COPD is a common and life-threatening condition in which a decline in lung function can be slowed down but not reversed.

CNN: Vitamin E may protect lungs

While a 2006 French study found that people with diets high in beta-carotene had a slower decline in lung function over an eight-year period, heavy smokers and drinkers may not benefit.

CNN: Vitamin E may protect lungs