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Genetic link tied to smoking addiction

July 11, 2008 12:00:00 AM PDT
New research uncovered small genetic mutations in the body's nicotine receptors. University of Wisconsin and Utah researchers estimate 40 percent of people have genetic variations that increase their odds of being a heavy smoker especially if they started young. Experts say understanding how small biological changes add up to big differences in addiction risk may help design more personalized cessation treatments.   Click here for more headlines from ABC7 Eyewitness News