When has being a yid with cancer ever defined that yid?
I think I hear what you are saying but to me it seems to all semantics and based on shame. A person who repeatedly fails and finds he is doing things against his own will - cuz he feels he has to - is likely an addict. If these things are damaging his lifestyle, then he is actually a sick man. Like me. Talking of 'defining' is just a way of escaping the label, as far as I am concerned.
If I am an addict and my life is truly actually not in my own hands, that is one of the most important facts for me to recognize. It does not 'define me' any more than my height does. Sure, life can go on for some time with him behaving this way....but when those big bumps in the road of the life of an addict occur, it gets uglier....and still uglier. The excuses abound, and all get used-up in the process: the shunning of labels, our blaming of others (especially those we love), and even blaming yiddishkeit (guys call it "eventually my emunah was getting weakened!") . Eventually they pass, until the next bumpy ride, maybe a year or two later.
Those who are lucky enough to see a pattern get help. They call themselves addicts because they come to see that, as they are, their lives are actually not manageable by them. This comes as a shock to most, but eventually is accepted. Some need help in the form of other people who have accepted it, just to get comfy enough with it. Some have to go pretty far down the ladder to actually surrender to the truth, some do not.
I did not have to go that far down the ladder, compared to many others. Boruch Hashem. Some had a much more pleasant trip than mine. Some went through absolute hell - and took their wives and children with them, nebach.
And when they get together, they come to see that there is absolutely no difference between them - each is just as out of control as the other, in the long run. An addict is an addict, and speaks the same crazy language inside. One just brought it out b'po'el more than the other.
"v'chanosi es asher achon, v'richamti es asher arachem." Who can understand it? Not me.
Hatzlocha! I am not judging anything about you! Only you can ever know the truth about you, not anyone else.