Very interesting, Taz....
I know a guy who had a nasty cocaine problem. Nasty. Went to rehab a couple of years ago. Quit doing coke. He says he's 'clean'. His family says he's 'clean'.....yet, he drinks likes like a flippin' fish.
In my mind, there is some denial (in this case) about what 'clean' is. I don't know....but it is interesting.