LISA FARRELL School of Economics and Geary Institute, University College Dublin, Ireland DAVID FORREST Centre for the Study of Gambling, University of Salford, UK MARK GRIFFITHS International Gaming Research Unit, Psychology, Nottingham Trent University, Nottingham, UK MARTIN PALDAM Department of Economics, University of Aarhus, Denmark SARAH SMITH Centre for Market and Public Organisation, University of Bristol, UK IAN WALKER Department of Economics, University of Warwick, Coventry, UK