“…For example, diffusion in the 1980s and early 1990s of the "new" practice of bleaching used syringes to reduce the spread of HIV required some antecedent congruence of the practice with existing conditions and drug injection conventions (e.g., using water to unclog the syringe), dissemination and encouragement by trustworthy "change agents" (such as community-based outreach workers), and acceptance by key "opinion leaders" or influential peers before a notable portion of the population adopted the practice (Friedman et al, 1994;Rogers, 1995;Watters, 1987;Wiebel, 1993). In addition to standard prevention messages and materials, RAP incorporated intervention components not previously used locally, such as harm reduction slogans (Latkin, 1998b;Latkin & Knowlton, 2002;Latkin et al, 2003) and promotion of rubber tips for the ends of crack pipes; the latter may reduce oral transmission of communicable diseases facilitated by bleeding or ulcerated lips caused by scorching, or that are transmitted through saliva (Faruque et al, 1996;Porter & Bonilla, 1993). We anticipated that these novel intervention components would diffuse through drug-using networks as PHAs promoted harm reduction practices and attitudes among their peers.…”