Of course he's using. Given he is unemployed, I wonder the source of funds. Don't you? COuld there be a connection with Craig's List?
If all it took to snap someone out of it, was calling them on the carpet, none of us would be here. No one just snaps out of it.
When I used to try and reason with my daughter, it was all about my need to be in control. When my attempts failed, I felt diminished. It took time for me to get and be humbled that I have absolutely no control or influence over my daughter's choices and her choices have consequences.
How old is this guy who cannot sustain himself without his parent's help?