This is such an interesting thread.
I quit smoking weed last year, after smoking pretty much daily for 30 years. I was what people (including me) would call a "functioning" addict - I've always worked, for example. It always felt to me that being a bit stoned all the time was my default setting. I didn't feel like myself otherwise.
I don't even really know what the trigger was for me to stop. I just decided enough was enough. It was hard for a few weeks, and I would find it really difficult to refuse if someone offered it to me, probably forever. But I actively chose to not buy it anymore, and I don't really socialise with anyone else that smokes, so in that respect, it's easier for me to not be tempted.
I'm 53 now, and when I look back at my childhood, there was probably a fair bit of undiagnosed trauma, my parents have both been married three times each, and that would have had an effect on me without me realising, I expect.
I'm glad I stopped. I miss it, though, really miss it. I've found other things to replace the obsession, wellness and exercise, that sort of thing, and I do actually feel more 'me' without it, although I never thought I would. But the temptation will always be there, it's like a part of me that's missing. I just made the choice not to have it anymore.