Robert Weathers PhD of California Southern University summarises two recent and authoritative research studies (from Harvard University and the University of Michigan) which focus on the crucial contribution of spiritual resources in the process of recovery from addiction, for example, in 12-Step programs.
I found this video to be very interesting. Robert also mentions the Buddhist Recovery network website which contains a number of resources and is well worth a look. This network was co-founded by the late G. Alan Marlatt, one of the all-time great researchers and clinicians in the addiction recovery field.