It’s weird to say this though. Because stock comp is purely additive in almost all cases. The amount it adds to your pay is variable, and in extreme circumstances can even be $0. But it’s not like you can really lose money because of equity based pay, under normal circumstances.
You could be compelled to accept a lower salary with the expectations of stock being worth lots of money then it actually (as is the usual case) ends up being less than salary would have.
I mean this scenario only happens at just about every startup if you read peoples experiences though I don't know if there are or if its possible to have a study done on this since the data is likely private.