Thanks for the suggestion, Solarion. I read it this weekend and found it very interesting-- a very rational, clear look at research and real world experience of quitting. They definitely take the position that using and quitting are choices -- i.e. we're not powerless.
I like how they encourage people to "work the upside" -- to consider what are the benefits of quitting and reframe in terms of benefits, instead of quitting just to avoid costs and pain. It's about choosing happiness.
They leave the option of "moderation " on the table. My beast certainly liked that (it was reading along), but irrelevant for me. Not sure what to make of that without reading the research they cite. Off topic for SR anyway, I suppose.
Anyway, an interesting read -- thanks for raising the topic.