1. UK Centre for Tobacco and Alcohol Studies; Department for Health; University of Bath; Bath UK
2. Department for Health; University of Bath; Bath UK
3. UK Centre for Tobacco and Alcohol Studies; Division of Epidemiology and Public Health; University of Nottingham; Nottingham UK
4. UK Centre for Tobacco and Alcohol Studies; National Addiction Centre; Institute of Psychiatry; King's College London; London UK