1. Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, Ohio 43210, United States
2. Center for Tobacco Research, The Ohio State University Comprehensive Cancer Center, Columbus, Ohio 43214, United States
3. Department of Chemistry, Faculty of Arts and Sciences, American University of Beirut, Beirut 1107 2020, Lebanon
4. Center for the Study of Tobacco Products, Virginia Commonwealth University, Richmond, Virginia 23220, United States
5. Division of Epidemiology, College of Public Health, The Ohio State University, Columbus, Ohio 43210, United States