According to Wikipedia THC has very low solubility in water, so I'm going to guess that it wouldn't work particularly well. You might be able to use dried cannabis in something similar to a sage derby, but I also don't think it would taste very good. I don't actually know what cannabis tastes like, but as a Canadian I've smelled the smoke enough to have a rough idea (personally not a fan at all). Interestingly some of my friends in my old home brewing club made a cannabis IPA and apparently it was quite good. They dry hopped the beer exactly like you would with hops. Cannabis and hops are related and I can see the aroma being similar. I think I would go with that approach instead -- THC is very soluble in alcohol. They claimed that the approach was very effective in achieving the "medicinal" effects they were seeking as well as being quite delicious.