1. Departamento de Economía, Contabilidad y Finanzas, Universidad Politécnica de Cartagena , Cartagena , Spain
2. School of Management, University of Bath , Bath , UK
3. Tobacco Control Research Group, Department for Health, University of Bath , Bath , UK
4. Research Unit on the Economics of Excisable Products, University of Cape Town , Rondebosch , South Africa