He didn't say sniff the dust .
A fresh cut cocobolo will have an aroma.
Just like BRW. You can smell them .
3M makes a double filter mask . It's what I use
Your comment was based upon the first sentence, had you read further, you would have a better understanding. You have a zeal to comment without reading and fully comprehending, this thread is proof of that.
I have always used 3M masks and once again Joey, it does not bother me, will you please get this thru your head?