Many I'll tell u about wood dust I was a Sawyer in a lumber mill.  You can smell the wood and determine what you were cutting by the dust.  Best was  cherry, birch, hemlock, walnut etc... and I got to saw up a Mahogany log that was quarterd and was still 6 ft wide 5ft thick and 16ft long...was so big I had to cut a notch in it to fit through the top saw...  AH memories of blowing out green and black boggers!!! lol
Russ