It was the smell of carpets with me - and also creosote - I would walk to work a particular way where the fencing smelled particularly strong! With my second son it was ice cubes - I devoured tons of the things and would sit on a night with a glassful chinking away with a spoon. Strangely I still love ice lollies and generally eat one every day - as I can't taste them it's the texture I love.
Threatened with legal action (follow on from potential scam thread)
hic!) and stopped biting my nails, forever.