From my understanding, the authors are using scientific data from massive studies that showed that many people who had substance abuse problems solved their problems and are now moderate users. I'm not defending moderation, I don't think moderation is for me, but I never wanted to use moderately, I always used for the high and the higher the better. I don't think they are promoting moderation either, just like they aren't pressuring people to quit, they are presenting information and challenging the recovery industries messages about addiction, and then leaving the decision up to the reader as to what they want to do about their substance abuse issue.