... include mother’s and father’s age at the time of the child’s birth in quadratic, indicators of whether the mother or father is currently a smoker, indicator of whether the mother smoked during ... include mother’s and father’s age at the time of the child’s birth in quadratic, indicators of whether the mother or father is currently a smoker, indicator of whether the mother smoked during ... the child’s birth in quadratic, indicators of whether the mother or father is currently a smoker, indicator of whether the mother smoked during pregnancy, the number of years the child has been...