“…We hypothesized that staff may have been more uncertain and ambivalent about cannabis use by clients than might have been the case for other substances. Staff attitudes, in turn, might have been influenced by the confusion in the literature about the association with psychosis and the general societal ambivalence towards cannabis use (Graham, Copello, Birchwood, Orford, McGovern, Georgiou, et al, 2003;Graham, Copello, Birchwood, Mueser, Oxford, McGovern, et al, 2004;Graham, Copello, Birchwood, Orford, McGovern, Mueser, et al, 2006). In order to seek further evidence, the current qualitative study was designed in order to explore the attitudes, beliefs and experiences of mental health professionals working with clients who have severe mental-health problems and who also used cannabis problematically.…”