1. Otago Medical School, University of Otago , Dunedin , New Zealand
2. Department of Public Health, University of Otago , Wellington , New Zealand
3. Centre for Bioethics, University of Otago , Dunedin , New Zealand
4. Tobacco Control Research Group, Department for Health, University of Bath , UK
5. Department of Preventive and Social Medicine, University of Otago , Dunedin , New Zealand