PG is a form of alcohol itself so it can extract the goodies out of wacky tobaccy just fine along with a bunch of other things which are soluble in alcohol. Many commercial flavoring tinctures use the stuff. Not as quick as high proof and high dollar Everclear but will get the job done. Heat helps speed it up. Not quite sure how the thread got swung over to hash making but doubt it be good for that purpose. What it would take to make it evaporate I am clueless. Heat and air most likely

Goober