Thought nowadays is that it is situational combined with the dependance gene. If they are in a clean environment that is structured, they stay clean. They get out and go back to the same streets, friends, and family and they eventually start again because those around still do.
Thought nowadays is that it is situational combined with the dependance gene. If they are in a clean environment that is structured, they stay clean. They get out and go back to the same streets, friends, and family and they eventually start again because those around still do.