“…This is surprising considering that cannabis use increased rapidly from the late 1960s to become the most widely used illicit recreational drug in the United States and, more recently, in Australia (Donnelly & Hall, 1994). Although there have been studies of chronic users in Jam aica (Rubin & Com itas, 1975), Greece (Stefanis, Dornbush & Fink, 1977) and Costa Rica (Carter, Coggins & Doughty, 1980;Page, Fletcher & True, 1988) only a limited number of small sample studies of long-term users were conducted in the United States over 10 years ago (Haas & Hendin, 1987;Hendin et al, 1987;Rainone et al, 1987;Roffman & Barnhart, 1987). Consequently, there is limited information on people who have used cannabis regularly for 10± 20 years or more.…”