A new study co-authored by College of Nursing Professor Ellen Hahn, PhD, RN, FAAN, found that roughly 15 percent of college students who had ever used tobacco currently use more than one tobacco product. Polytobacco use (using more than one tobacco product) drives nicotine addiction and can prolong the use of tobacco products, leading to acute and chronic negative health risks such as lung cancer, chronic obstructive pulmonary disease and more.