The black pepper and turmeric is going to add to the marijuana like feel some people attribute to nutmeg, I think, because on their own black pepper and turmeric produce an effect that's sort of like a very mild marijuana high, not the same but similar.

I can't find any good source with numbers to back up that claim. I see mention of it on Erowid and many other places, but none give any numbers on the actual quantity present.

Here's a few sources stating that it's present:

SWIM doesn't have all the ingredients for testing this out yet. But at some point he will try the authentic recipe.