Yet another reason to stay as far away from smokers as possible: According to a study done by the University of Texas Medical Branch in Galveston, women who only occasionally inhaled secondhand smoke were 70 % (yes! 70%) more likely to have an abnormal Pap smear, risk factor for cervical cancer, than those women who rarely were exposed.  The researchers speculate that the carcinogens in tobacco smoke cause DNA damage that lead to changes in  cervical cells.  So next time a friend or family member lights up, whip out this fact, offer them some gum instead and let them know your health is at risk too!