I came upon ACT after learning about AVRT and mindfulness. To me, they seem to be different aspects of the same aspect of good old mental hygiene, and have much in common. As Carl suggested, acceptance and mindfulness of 'what is' and a commitment to our desired end situation is applicable to life in general and not only to addiction.
I wonder if these skills like ACT, CBT, REBT and mindfulness, so obviously lacking from me when I was in active addiction, might actually have prevented addiction from happening in the first place? If these aspects of mental self care would have reduced my desire for escape?