Simler's article has this simple diagram of a brain topology, where we see an Addiction as a nexus that's almost but not quite an independent living agent inside the Person.
Thinking about inner multiplicity like this, it seems natural to also think about the structures associated with Projects, interests, and vocations. I am a programmer but also a woodworker. These have their own languages, values, worldviews. They aren't just "roles" in a social sense. They are structurally similar to Addictions, gods, or selves.