When I was with my son, who is an addict, I talked about anything and everything under the sun EXCEPT his addiction. If, and when he brought the subject up, I was glad to listen, but didn't offer any advice..(very hard for ME to do... lol)
I have always had a list of free rehabs sitting by the phone so if he asked for my help I could direct him.
The hardest part for me to learn is that I have no power to change anyone.
Hugs, and prayers