Problem gambling is a significant mental health problem in Australia. Estimates of the prevalence of serious gambling problems in Australia range from 1% to 2% of the general adult population, with higher rates in specific groups.1 An estimated 2.5%–5% of the Australian adult population display at-risk gambling behaviour (according to standard diagnostic criteria).1 The prevalence of problem gambling exceeds that of stroke and coronary heart disease, and is comparable with the estimated prevalence of type 2 diabetes in Australia.2