Back when I was living in B and T Crowd territory, my family had a cat who lived for 16 years, passing away in my sophomore year of college, yet I don't recall catching him hooking up with some plastic lover. The more recent cat left Old Navy bags dripping with saliva. I asked the vet about this and she said she hasn't heard anything negative about the practice. I'd imagine he's ingesting some amount of plastic toxins, but if the vet says it's fine, then it's fine.
Looks like our Cat isn't the only plastic lover.