He brings a big saucepan of water to the boil and then very lightly simmers it after putting in the dried tobacco leaves. He's careful to only stir it in one direction and says various prayers which are a secret. Usually it is left to cool down and is drunk cold. Usually drink down in one go a large glass. Then you wait for the effects to come on, which might be some nauseousness, maybe vomiting.

Yes rapé is used a lot around here. That's a pretty little applicator that you have there. I've also seen people consecrating sananga, and kambo during cerimonies.