Excellent topic. I agree with the OP that self is the issue. Sobriety is within a person, not dependent upon circumstance. There are addicts in my life, too.
Housemate has a seamstress for his complicated multi-pocket shirts. She has a daughter about 30 something who is a Physician's Assistant--brilliant etc. And chock full of RAD generated dysfunctions. She is chronically depressed and on prescription meds. Psychiatrists have been mostly no help if not part of the dysfunction. She persistently demands that others virtually force her to be happy. Will never work. She becomes suicidal frequently.
My housemate shocked himself a bit by telling the daughter once on the phone--'Well, if you are determined to be miserable--just go on to hell. But it's rather irrational and stupid to think that HELL will be MORE comfortable than life here!' Last he checked, she's still alive--sort of.
There's a Scripture--the KJV of which says, "As a man thinks, so is he." Psychology is full of verification of that Scripture.