1. Department of Health Promotion Sciences, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, Arizona, USA;
2. Arizona Smokers’ Helpline, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, Arizona, USA;
3. Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, Arizona, USA