Most but not all. The opposite trend is less common but totally possible from personal observations. saying that a psychiatric procedure will result in specific changes would be stretching the truth from probably to necessarily.
The first result I found in Google related to Griffiths is here:
https://pubmed.ncbi.nlm.nih.gov/31084460/
They are doing an anonymous online self selected reports and they find a strong effect but also 17% do not appear to exhibit the trend.
For some perspective, this is the current state of the art pharmacological treatment for substance abuse disorder, as in no other available treatment has a stronger effect.