The constant checking on the refridgerator for food even though you know there is none in there; usually occurs every 2-5 minutes for a person not smoking pot. For pot smokers, it occurs about every minute followed by vacant stares.
Normal person: Bro, I've pulled about 5 fridge scans and still nothing...lets check the pantry!
Pot smoker: Broooo, I've fridge scanned like 5 times in 5 minutes and still nothing. (followed by the vacant stares)