2. How does positive psychology differ from regular psychology in terms of addiction recovery?
I think Positive Psychology offers a different approach from traditional therapy that focuses more on what you are doing "right" and how to amplify that instead of focusing on what is wrong and what you are trying to avoid. When you focus on your strengths, particularly in the beginning of recovery, it can feel empowering and give you a much-needed boost of confidence.
Knowing and using your top 5 strengths in new and creative ways (I use the VIA Strengths test at www.authentichappiness.com) has been found to make people both happier and more successful. Positive psychology also brings in concepts of getting into flow by challenging yourself with hard goals, and then using your strengths to make progress on those goals.
There is research showing that all success with goals is preceded by being in a flourishing emotional state, so I'd also suggest that everyone in recovery learn about the research on "positive interventions" - the behavior/mental shifts you can deliberately perform to put yourself into a flourishing state. It's important to also understand how to set the "right" goals that will enhance success, not focus on superficial or extrinsic outcomes.
There are also concepts around savoring that can be taught, as well as mindfulness meditation, that enhance self-regulation and reduce impulsivity. I'm also a big believer in teaching people how to become more resilient, much like is being taught to the US Army right now by Positive Psychology researchers from the University of Pennsylvania. You need resilience and grit to survive the setbacks and challenges that inevitably occur when you are pursuing recovery, and although you may stumble upon these concepts in random ways, I believe they offer so much hope and practical guidance that Positive Psychology should be integrated at the start of anyone's recovery.