Like Tom, (mftha) I ALWAYS wear a dust mask when cutting wood in my shop. I do have a dust collector that is always in use as well, but, and this is MY opinion here, I don't believe ANY dust collection system catches all the dust. I have plans to start using a box fan with a simple furnace filter taped to the intake side. This is to catch most of what is floating in the air. I know it won't catch all of it, and certainly won't catch the fine dust, but it's better than what I have now, which is nothing.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.