Always beware whenever an addict "positions" themseves as rescuer or saviour.
We have enough trouble just hanging on to our own asses.
Some of us are not responsible enough to only be accountable to ourselves.The wayside is littered with junkies who felt they shouldn't have to answer to anyone.
Focus on helping your son to understand that his salvation can only come from within.
Your friend already knows what he has to do.