I'm thinking it's a organic chemical that's trapped inside the plastic and outgases out of the plastic over time. I'm not that familiar with all the types of chemicals in the plastic as they are proprietary for the most part. Trade Secrets. Perhaps they should have issued a Material Data Safety Sheet (MSDS) for the plastic baits as that's normally required by law. But not everyone in the manufacturing business issues an MSDS. The MSDS should say what chemcials are in the product and how they affect human heath and safety. IE if they are hazardous or flammable.
Not all plastics are the same either.
Bottom line is that we really may never know exactly what's going on.



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I've been biting the heads off plastic worms for years!
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And he does not recommend anyone else do that.