Plastic is hard to avoid in our daily lives. Even if you’re the kind of eco-conscious citizen that wouldn’t be caught dead without your S’well bottle and somehow remembers to bring reusable bags with you to the grocery store, chances are, you’ve been chewing on plastic all this time without even realizing it.

That piece of gum you’ve been gnawing at all morning? Yeah, that’s single-use plastic.

Many brands list gum base as one of their ingredients—it’s basically what keeps your gum long-lasting and non-biodegradable. By labeling it as gum base, chewing gum brands can get around disclosing many of the plastics you’ll find hidden inside, like polyethylene, polyvinyl acetate, butadiene-styrene rubber, petroleum wax, and a whole lot of other hard to spell words.