I know a girl which had a dear friend going down af. He could ring her in the middle of the night cause he had too much cocaine and couldn't hold himself.
So she usually had to get up and go at his place otherwise he used to get heroin in order to slow down himself. What a fucking life.
When she told me that I realized how some guys I used to know got into heroin addiction. It wasn't the drug itself, the were covaine abuset, but that triggered a secondary need that later on threw them in a even bigger problem.