Breathe safely!  Saw dust is a big problem. . .and it's easy to not wear a mask.  Dust collectors only do so much.  If you're in the shop a lot and you're not wearing a mask, do yourself a favor and get one of these masks.  I personally endorse them.  I use them.

They're under 30 dollars, but more importantly, they work -- and they're comfortable.

Please use the linked picture below to check out RZ masks...
(I am not selling them directly yet, but your click helps Scrollsaw.com, thank you!):

CLICK THE ABOVE PICTURE TO GO TO RZMASK.COM FOR PURCHASE!