The modelling of injecting by injecting drug users (IDUs) around non-injecting drug users (NIDUs) is examined as a precursor to NIDUs initiation into injecting. Structured self-report interviews were conducted with 86 IDUs. 86% of the sample had been initiated into injecting by an IDU: 78% of their initiators bring either a friend, partner, or sibling. Only 7% of respondents reported being pressured into injecting. 70% of respondents assessed that modelled injecting had been an important influence on their decision to inject by making them curious about injecting. In turn 98% of the respondents had modelled injecting around NIDUs, but 59% reported being unsure, or thought it unlikely, that they had made someone want to try injecting. Of these respondents 90% had talked to an NIDU about injecting, and 77% had injected around an NIDU. The findings suggest the need for interventions that raise awareness about the socially transmitted nature of injecting drug use.