I dont get itchy but osage and especially ipe will tighten up my chest at the base of my neck and its not comfortable so I wear a good respirator. I think dust masks are almost useless.
Dust masks are useless. They only work for maybe a minute or two, until they become completely clogged with dust, and then you might as well not wear it. I noticed with osage, ipe, and yew, that when I was using my belt sander, I would get a bit short of breath, and dizzy. And yes, yew is toxic. The berries and needles are extremely poisonous, so I don't imagine the dust is any better. I'm sure it probably causes cancer, as well. Please everyone, invest in a good respirator mask, and use it!