Anyone can have an allergic reaction to anything. My grandmother had a long list of allergies. She was even allergic to her own hair.

 

Yeah, heard that multiple times over the decades. Walnut dust and chips are also deadly to plants and trees, so not to be used in composting. Walnut grove farmers would plant new trees and plant evergreen trees around the walnut seedlings to protect them until they got established. As the walnut trees matured, they would kill off the evergreen trees allowing room for the walnuts to grow.

 

Walnuts are toxic to horses IF I recall as well?

Black Walnut Toxicity in Horses

Dr. Courtnee Morton discusses everything you need to know about black walnut toxicity in horses, including signs to look for and tree management options.

www.petmd.com

 

I sneeze a lot when working with walnut. I would still rather work with walnut than any other wood.

 

I've reacted to Oak when combined with sweat in the crook of my arms, and have reacted to antique Japanese lacquers blistering as they are made from oils processed from the Urushi tree that I think is related to poison ivy, etc.