Its best for it to be inert and that isnt hard . The best candidates are lab glass and keramic . Maybe keramic as a sandwich with copper . With the copper sealed in or not open to air circulation .

We used to cook food in copper pans and boil drinking water in copper ketles . Nowadays we dont .

" Traces of copper are a natural part of some enzymes of the human organism. "

How big are those traces ? The traces in cells and the traces one would get from inhalation ? Are they comparable ? What about regular inhalation ?