I think that was more or less what I was getting at, actually. Most human addicts, when asked, will describe their initial experiences with substances as being a liberating escape from a "cage"; i.e. the painful experiences and intense pressures of human society. Of course, over time, addiction becomes a cage-within-a-cage. Then, the lack of humane options in working one's way out of addiction (such as permanent criminal records/stigma) function as another cage.
So yes, if those proverbial/literal cages were relaxed, an addicted human allowed to frolic with the other humans would do better in comparison. I mean, duh. But they would -- in many cases -- still use a hell of a lot of their preferred substance. The physical withdrawal symptoms for severe alcohol addicts are utter hell (and medically very dangerous); the relaxation of social judgement wouldn't do much to relieve the tremors, hallucinations, vomiting/shitting, seizures, etc. (I never got far enough into heroin, but my understanding is that quitting it is pretty nasty, too.) The unpleasantness of withdrawal reinforces continued use, which is why most addicts are eventually using just to function. And people would continue to do the embarrassing/annoying things that intense/regular intoxication brings; they'd still forget birthdays, screw up badly at work, react badly to criticism, and so on. In other words, the other humans would still eventually get sick of their bullshit.
And yes, there will always be that subset who get addicted. A nicer cage isn't going to magically cure the preexisting brain chemistry issues that often mark people for addictive behavior. Peoplerats are still going to have predispositions to chronic depression, or still be wired to be highly driven/overly self-critical. I, for instance, had a wonderful childhood: travel all around the country (and beyond), relatively unstructured (home)schooling, and two loving/supportive parents. Still ended up massively cross-addicted, for some reason. It's that factor, combined with the complete re-imagining of peoplerat society, that causes me to describe the results of the study as "academic."