: Current smoking prevalence in Thailand decreased from 1991 to 2004 and since that time the
prevalence has remained flat. It has been suggested that one of the reasons that the prevalence of current smoking
in Thailand has stopped decreasing is due to the use of RYO cigarettes. The aim of this study was to examine
characteristics of users of manufactured and RYO cigarettes and dual users in Thailand, in order to determine
whether there are differences in the characteristics of users of the different products.