99.xx% of Vaping toppers are Chrome Plated Brass.
Then you have the less than 1% Specialty items.
IF........and I do mean IF.............There is a problem with Chrome plating over Brass, it is a Problem with particular Manufacturers. Brass has been properly and successfully Chrome plated for several Decades for indoor and outdoor use.
The biggest problem I have seen in the Vaping community has been Device abuse from those wishing to Super Sub Ohm CHEAP CLONES of High end Drippers.
You don't just assume Chromed Brass will handle.heat the same as SS. Those that do, Don't know diddly!
* AGA-S is an excellent little RTA - a bit tall but compact overall.