Well, as interesting as it would be to know the answer to this, doesn't it just make more sense to stop doing it? The bottom line is that plastics are not intended as foods, and therefore do not require warning labels for consumption. They are also not considered toxic in the sense that their effects are considered only for external exposure.

One example, is that there is some type of plastic than when combined with chloroform or phenol actually forms mustard gas.

In other words, it isn't good to be eating something that is a big unknown like that. I'm not sure there is any concrete evidence that you can die from it, and I'm not sure you necessarily increase your risk of cancer either, but doesn't it make sense that there certainly could be some kind of danger there?