WOF does a good job during the day to make sure people stay in the smoking areas to smoke and vape but during the actual hours of HAUNT they have bigger things to worry about. As far as alcohol, they have an open carry policy during the actual hours of HAUNT. You mentioned CornStalkers, there are literally two booths that sell alcohol at the bottom of the hill (The Oasis and Oasis Deck).
My suggestion is if you don’t want to have to deal with the commoners in the stand by line entertaining themselves while waiting 2-3 hours per maze, pony up and purchase Fright Lane. I personally have never had to deal with smoking or vaping or drinking in line because I don’t stand in lines.