I worked at a movie theatre chain, I would never eat their popcorn, they use coconut oil loaded with transfats in the popper, lots of salt, at least where I worked it was real butter. Enough to make my gall bladder hurt from a small.
To make matters worse, if you go to an early show the popcorn is a few days old, they keep it in big bags in the back and empty that into the popper and then start some fresh so customers can smell it which causes cravings.