...social norm of "not using an illicit product", is shaped by local social interactions (Funk, 2005). "The local community is viewed as a complex system of friendship and kinship networks, as well as formal and informal associational ties rooted in family life and ongoing socialization processes"...

...hierzu Sampson und Groves:„This approach is grounded in what Kasarda und Jannowitz (1974: 329) term the systemic model, in which the local community is viewed as a complex system offriendship and kinship networks and formal and informal associational ties rooted in family life...