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A small study hints that a form of vitamin A may help prevent lung cancer in former smokers. In a study presented at the 38th annual meeting of the American Society of Clinical Oncology on May 21, 2002 in Orlando, Florida, researchers reported that a chemical cousin of vitamin A may reverse some precancerous changes in the lungs of former smokers.
While quitting the smoking habit significantly reduces lung cancer risk, former smokers remain at higher than normal risk for years afterward. In fact, despite kicking the habit, ex-smokers still account for half of newly diagnosed lung cancer cases in the United States.
For the study, 266 long-time smokers who had kicked the habit at least one year previously were randomly assigned to receive two ...