It's interesting that there isn't a common word for loss of smell, like there is with other senses.  Blind, without sight;  Numb, without feeling; Deaf, without hearing; and American, without taste.  
 I believe it might be evolutionarily in nature, somone blind or deaf can survive.  Someone without a sense of smell is in great danger, not smelling predators, or a gas line left on and such.