This is an interesting thread! I mainly focus on exotic hardwoods for building guitars and I can honestly say that I’ve never once put on a mask and my only dust collection system is a 30 Gallon shop vac.
This is what I’ve determined personally.
Zebra Wood just smells!
Lace wood gave a slight sore throat the first time I used it and hasn’t been an issue since
Padauk burns the heck out of my throat, makes my eyes feel like sand paper and makes my nose run like its negative 20 outside. Not only that, it stains blue jeans permanently. The ill affects have not gotten worse over time but they do not get better over time.
Walnut makes my nose run too but that’s because it’s such a fine dust (almost like sand)
Acrylic (I’ve made a ton of acrylic bodies over the years. It will make you high and can cause some upset stomachs do to its low melting range.)
Wenge, ossage orange, cocobolo, teak, maple, beech, snake wood, ebony, rosewood, yellow-heart, ash, alder and blood wood have never bothered me. I’m sure there is more but who can remember! I’ve also sprayed my fair share of nitro without a mask too!
By the way I just had my lungs tested due to an unrelated issue and they are perfect for my age group.
Anything can cause you cancer. Breathing some wood dust now and then won’t cause any more cancer than sitting in traffic sucking the exhaust fumes of the guy in front of you.