I've been making vaped weed butter/brownies/etc for the past 5 years with my volcano. The best bet is to use at least 20 grams per batch of brownies. For a good high. Remember a lot of the thc is gone so you need to make up for it by adding more. If you do it right (id say boil water then put a pan on top of the water melt the butter with the vaped weed and wait 2 hours tops) (simmer....after the water has already been boiling)