I just looked up this Wikipedia page (note: contains slightly disturbing photos of people's skin rashes) https://en.wikipedia.org/wiki/Urushiol-induced_contact

I just looked up this Wikipedia page (note: contains slightly disturbing photos of people's skin rashes) https://en.wikipedia.org/wiki/Urushiol-induced_contact_dermatitis https://en.wikipedia.org/wiki/Urushiol-induced_contact_derma... and it notes that > People vary greatly in their sensitivity to urushiol. In approximately 15% to 30% of people, urushiol does not trigger an immune system response, while at least 25% of people have a very strong immune response resulting in severe symptoms. I've also heard this about poison ivy. (I assume cashew plants have less of this irritant than poison ivy does.)