Dust isn't the claimed health issue - phenols are.
Back in the good old days, before there were internet forums and caresheets, many of us old farts kept their snakes on pine.
I had quite a few old snakes that lived long, productive and apparently healthy lives on pine.
All these young turks keeping snakes (in some cases for many months!) have repeatedly informed me that I don't know what the hell I'm talking about.
So I have come to the conclusion that I was obviously the exception to the rule - after all, all these people citing what they've heard or what they've read can't be wrong. Can they?