Board Thread:Speculation House/@comment-73.140.18.107-20160909055159/@comment-14909251-20160910172224

It is implied that Ozpin has lived an incredibly long time due to his Aura, so it is quite possible that it can prevent illness and have many of the effects you describe. As far as choking out, in theory it couldn't because even if the Aura protects them for a time, it can be broken if the person just chokes them long enough.