Cannabis policy is changing around the globe, with an increasing number of countries experimenting with different systems of decriminalization and regulation. This edited collection explores one facet of that phenomenon-the often-overlooked not-for-profit cannabis social club (CSC). The Editor's introduction charts a 30-year history of the development of CSCs encompassing their Spanish inception, spread throughout Europe and further afield, and transformation in some cases to a more commercial undertaking. As a whole, the collection moves beyond an individual case study approach to emphasize key connecting themes around policy environments, social elements and grass-roots development in the first part, and to link findings to wider drug policy debates in the second part.The first part focuses upon CSCs in different settings. In tacit acknowledgement of the increasing breadth of literature in this area, individual chapters focus upon more obscure aspects of CSC development and drawing out the important transnational [1] aspects of the phenomenon. The social aspects of drug use are widely acknowledged as being important, but generally under-researched [2]. This paradox is also to be seen within the CSC literature, focusing more frequently upon development and policy rather than community and social aspects of cannabis use.Marin-Gutierrez & Hinojosa-Becerra's [3] visual ethnography of the social meanings and manifestations of a specific Spanish CSC therefore provides a particularly important angle and demonstrates the rich variety of activity that can take place in and around cannabis markets. Other chapters in this section remain policy-orientated but are concerned with departures from subject norms, in that CSCs are often developed via bottom-up, grass-roots methods, and that they are increasingly welcomed in countries with less restrictive national policies [4]. For example, Musto's [5] chapter on Uruguay emphasizes the top-down implementation of CSCs in that setting, while Rychert & Wilkins [6] investigate the barriers to CSC development in New Zealand. Other chapters move the discussion beyond the national to consider comparisons between countries (Alvarez et al. [7]) and to explore the surprisingly limited transnational aspects of CSCs (Bone et al. [8]).A much wider, and very welcome, approach to the impact of CSCs is taken in the second part, where individual chapters aim to connect CSC-specific findings to relevant wider debates. In an impressive first chapter, situating the discussion within a wider context of cannabis activism, Rondelez & Pardal [9] combine a detailed appreciation of CSC policy development with a Foucauldian exploration of CSCs as acts of resistance capable of destabilizing mainstream narratives. Other chapters in this section draw out the finer detail of CSCs in relation to the wider medical and commercial regulation of cannabis (Fortin [10]), legalization of cannabis (Capler & Bear [11]) and the provision of evidence which can inform wider policy development (Dilley et al. [12]). The fin...