Anosmia is the inability to smell and is more common than widely believed. If you suspect someone you know, or even yourself, is anosmic, you'll find some great info in the Ten Handy Links below. They include scientific, anecdotal and support information and contacts.
2. http://www.maxuk.net/fascin.html out of date but some interesting stuff in the archived content
bonus link! http://www.anosmia.net/index.php online support group for congenital anosmics. That is, if you haven't smelled anything ever you'll find like affected people right here.