In 2008 tobacco was banned in federal correctional institutions in Canada. In this paper we compare the use of tobacco as currency for gambling in two studies that we conducted, one before and one after the tobacco ban. The data from two studies were compared. The questionnaires were administered to offenders in federal and provincial institutions in Ontario. Study 1 included 254 male offenders and study 2 included 395 male offenders. The focus in this paper is on one questionnaire about the type of wager made while incarcerated. It was found that the use of tobacco as a currency in gambling went from 28.6% of those offenders who gamble to 2.3% of those offenders who gamble. In addition, there was an overall decrease in the number of federal offenders who reported gambling while incarcerated. However, information gained from the questionnaire and from interviews with incarcerated offenders suggests that there has been a shift to money wagers and that gambling inside has become more serious since the tobacco ban. The results suggest that the ban on smoking has resulted in a change in the type of currency used for gambling inside correctional institutions in Ontario Canada.