Book excerpt: How do local drug markets impact on their 'host' communities? This report, based on the largest British study of drug-dealing to date, draws on work in three areas where drug dealing is prevalent, and assesses the the financial, social, environmental and cultural impact of local drug markets on the communities in which they operate. It documents the views of community members about the market and its impact, whilst exploring the career paths and motivations that lead people into drug dealing, together with the social and demographic differences between dealers, users and others in the community. The authors consider the extent to which drug dealers are predatory outsiders who 'prey on' the local community, suggesting that local drug markets are often integrated - to greater or lesser extent - in the licit and illicit economies of deprived areas. Understanding drug selling in communities highlights the complex nature of drug dealing and its effect on local communities. It outlines a range of possible enforcement measures and will be of interest to a range of practitioners concerned with communities, drug prevention and rehabilitation as well as local authorities, the police and probation service.