There's lots of research that points to that the brain after addiction just isn't the same as before addiction[1][2]. So while there might have been a root cause before, the effects of addiction is still present even if the root cause isn't an issue anymore.

[1]: https://med.stanford.edu/news/insights/2025/08/addiction-sci...

[2]: https://www.rockefeller.edu/news/35742-newly-discovered-brai...