Housing First options have been explored as an approach to alcoholism. I believe they started in Oregon/Washington areas, and we have one in Anchorage that's about three years old. The idea is that safe housing is a right, not a privilege. From what I understand, there are no requirements for employment or limits on alcohol consumption (assuming residents must be of legal drinking age).
We had a lot of resistance in Anchorage. People weren't accepting of the idea of housing people who just drink their lives away. But despite what might be the "gut" perception, residents have been shown to slow drinking and become more productive and healthy.
I believe these findings are pretty standard. I'm not sure this approach has been studied in other drugs.