I am sort of hard headed and it took a while for me to get it through my head - all workshop, fine particle dust makes you feel like !#^^%* when you breathe it! I am trying to get in the habit of masking up and ventilating more whenever I turn on the power tools. If you read up on the different species of wood that we are all sanding and grinding on, about half of them cause all sorts of respiratory distress. Add to that, the bone, antler, horn, and the man made stuff that is taboo here, and you got a recipe for serious lung troubles. A few pennies spent on a dust mask seems a good investment.