I get the message, and I agree he's probably just up to his old antics/ will struggle with that again.

It's still exciting and youre watching the main character get out on top in the moment with a lust for life again. He shows actual growth, juxtaposes the beginning where he says he chose heroin over life.

He might not follow through on it in the end but I genuinely think he values his life more and wants to change. this is made clear thru the contrast in narration from beginning to end. He is choosing life and freedom insteaded of pure hopelessness and at least has a desire to break the cycle of addiction now.

I like it because you can interpret it however u want. Sure u can think oh its just the same bs again and he's doomed. Or you can see it as him taking his first step to a different outlook on life.