I’ve been lazy here of late. In that vein I’m going to offer you a link rather than typing out the conclusions, in my own hand.
It’s been known for over 100 years that there’s a synergistic relationship between opiates and THC. This is a talk about a clinical study basically proving it.
Two things about the video bother me a tad. They used Marinol rather than whole plant THC. I can’t argue with her reasoning but, it does seem like it was the easy way out. The other thing is that damned laser pointer! She drove me batty with the friggin’ thing. Anyway, if you have a half an hour to burn consider checking it out.