Interesting study, I hadn't seen that one. I think one of the problematic points is this though: "...the chances of winning prizes increased with continuous tim

Interesting study, I hadn't seen that one. I think one of the problematic points is this though: "...the chances of winning prizes increased with continuous time abstinent." They're literally upping the "dosage" over time. Also, the variability is in the chance of receiving a reward or not. I think that's a crucial element: rewards work well when they're not guaranteed. My final observation regarding the study is that it only lasted 12 weeks. I'd be worried that the reward group might have a higher percentage of post-program relapse than the non-reward group, as there is significant literature behind the idea that once rewards are stopped the desired behavior stops as well. I appreciate the study! Always interested in reading more about human behavior.