Dogs breathe in the smoke more through their nose, where the nasal turbinates grab the tar and carcinogens before the smoke makes it to the lungs. (illianaveterinaryhospital.com)
Dogs with long muzzles have large nasal chambers with thin, curved bony shelves called turbinates projecting into the chambers from the sides. (allstarfrenchbulldogs.com)
It sometimes causes irreversible erosions and changes in linings of the nasal passages (naso - turbinate bones) that can be helped but never entirely cured. (2ndchance.info)