Background and aims: For people trying to stop using alcohol or other drugs (AOD), the process is often characterised by periods of abstinence followed by relapse into their previous drug-related way of life and subsequent re-entry into the treatment system. There is a call for greater attention to the how of these transitions, with a special focus on the phase of leaving treatment. The aim of this article was to get a better understanding of the transformation of practice when moving from a drug-using to a non-using lifestyle by exploring the experience of (1) the involvement in treatment settings, (2) the process of leaving treatment, and finally, (3) the early phase of changing everyday practice into a drug-free way of living. Method: The article takes on a social practice approach, in particular Bourdieu's concepts of habitus, "doxa" and field to analyse 17 in-depth interviews with Norwegian men and women seeking treatment for problems resulting from the use of drugs and/or alcohol. Results: The study shows that the support of professionals operates as transitional relations that can bridge the transformation from a drug-using to a drugfree life, by providing a social web of relations, positions, settings and activities. However, leaving