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The following is an article from High Times magazine April 2007.
What About The Duff?
Spent herb from a vaporizer isn't ash because it hasn't been burned. Instead, it's a brown, very dry version of its formal self, called duff. Post-vaporization duff can be used for many things, including potpourri and as cooking supplement.
Less efficient vaporizers- including some portable conduction models- aren't capable of extracting all of the resin from the pot. Thus, many users take their duff and make edibles out of it. While these may not feature the punch of edibles created using good bud or top-shelf shake, some users report creating relatively high-quality results from their spent duff.
I personally find it pretty hard to argue with high times magazine
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