1. Centre for Tobacco Control Research, Institute for Social Marketing, School of Health Sciences and Sport, University of Stirling, Stirlingshire, UK
2. UK Centre for Tobacco and Alcohol Studies, Nottingham, UK
3. Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC
4. National Addiction Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK