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That old finding. Smoking during pregnancy is a valid reason, though I would imagine the substance would affect the brain more than the lungs of the fetus.
@Sorrowless: Not just the fetus. It was my grandpa. My dad has never smoked and my grandpa quit by then. It was passed down two generations even though my parents never smoked once. It's not so much cutting a limb off as it is rewriting your genes.