If by stucco you mean the earthen lime plaster! I don't know if that's what exterior plaster is called, but they have it. It "breathes" so it will not be a gold place for mold to grow inside your walls.
I've been selected to go to the moon! All thanks to this tiny ad:
Mike Oehler's Low-Cost Underground House Workshop & Survival Shelter Seminar - 3 DVD+2 Books Deal