Imo all addiction stems from avoiding feeling your feelings, because you believe you’re not strong enough to handle them.
A cold plunge forces you to feel your feelings and thereby reminds you how string you really are. 
Discussion
*strong*
I love hot showers, at least I used to. Eight years ago I heard about Wim Hof, the Iceman. Since then, all my showers have been cold, and every morning, a shock of cold reminds me that I'm tougher than I thought I was.
I also use less time, energy, and water getting clean. And it's an instant 100% wake-up.
Most people I tell about this in real life think I'm crazy. Like when I tell them about Bitcoin, nostr, refusing to wear shoes with "arch support", or eating only meat.
I wonder how many will read the above think I'm partly crazy, as in some variation of: "Well, sure, cold showers and barefoot shoes are great, but you'll get cancer if you don't eat enough vegetables!"
First time hearing about arch support. You have any resources about it? Like what it is and why its bad?
I think there’s something to that, but I think it would be tough to explain to a child whose parents used drugs that their addiction is purely psychological and not physiological. Have lost friends to addiction that genuinely no amount of psychotherapy could change. It’s synonymous to saying that all illness derives from a lack of quality self care while people with type 1 diabetes and sickle cell anemia are just plagued from the start.
Big string theory guy?
I think addiction is simply pressing the cheap dopamine button too often
Coffee and nicotine are the worst to kick
you don’t look like Harry Potter anymore
Contrast therapy is great!