Inhalation of fresh zinc oxide causes chills; aka- zinc chills, brass founders ague, oxide shakes, etc. But if the oxide is a few hours old it will not cause chills. I had them once long ago, an old experience person explained the situation which I had never heard of. Pollution controls and modern safety practice have made it very rare in the US today. It can occur if one inadvertently causes a "zinc boil" by overheating a brass melt or oxy-acetylene cutting galvanized steel, etc.