Treatment with a derivative of vitamin A called retinoic acid was associated with reduced lung cell growth in a group of former heavy smokers, according to a study published online October 30 in the Journal of the National Cancer Institute.Former smokers remain at elevated risk for lung cancer. According to one speculation, lung cells that were damaged during years of smoking may continue to grow and evolve into cancer even after that person has quit smoking. [click link for full article]

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