Originally Posted by
Grey_Wolf_c
I think this is a semantics question. If you define breathing as the biological requirement to exchange oxygen and carbon dioxide with the air in order to continue to live, a vampire doesn't breathe. It can still use his lungs as a bellows for such things as talking, smoking and smelling, but he doesn't breathe since he doesn't take air and return carbon dioxide.
As I say, this is semantics: similar to how the answer about the tree falling in the forest making noise depends on how you define "noise" (I, as an engineer, define it as "shock waves propagating" which makes the answer "yes", but others define noise as "waves arriving to a hearing sense" which makes the answer "no").