Courtney VanHorn, 18, of Plum (left) and Kristen Erosenko, 19, of Monroeville spoke at The Sphinx Cafe, a hookah bar in Oakland, on Thursday evening, September 4, 2008. More than two in five college students have smoked tobacco from a waterpipe or hookah, and researchers are concerned because a third of those students otherwise would have been tobacco-free, according to a University of Pittsburgh School of Medicine study.