What's worse, the fast food or the wrapper?
I wasn't thinking that you eat food wrappers by the way. However, even unwittingly you probably are. The reason behind this is that each time you buy fast food, popcorn, or any fatty food for that matter, heat and fat cause the chemicals in the package linings to leach out into the food it covers or envelopes.
So when you store food at home, remember to let it cool first and then store it in glass containers. As far as fast food is concerned, the best suggestion is to avoid it like the plague because it is basically causing your health to decline.