YES!! Our Sunny chews plastic grocery bags...but she also ingests them, so we have to be careful to watch to be sure there aren't any around. We suspect Sunny's obsession (and, it is a genuine obsession, mind you) came from an incident of my daughter (quite a long time ago, and she has gotten much more responsible and aware of how to treat kitties...so no worries) deciding Sunny would look cute in a plastic bag, hanging from her bedpost. Sunny was just fine, we took care of things quite quickly, and she has been fine since (thank god she didn't become feral from the experience...she's still our friendly little kitty), but ever since has had this huge obsession with plastic bags. We just keep them off the floor and away from her because they seem to upset her.
Anyway, yes, we have a bag-chewer, too. I wish she had a less sad reason for it, but alas...twas not to be! Needless to say, our daughter got lessons on how to treat the kitties, and is now MUCH more responsible with them. In fact, Sunny's brother, Hobbes, follows her around the house to play!