Most fish, but in particular fish pie. Had to make an excuse and walk out of SIL's house once when I'd popped in for coffee as I just couldn't cope with the smell of the fish pie she was cooking. It honestly makes me heave, and obviously I can't even think about eating it. As for tinned tuna, oh God I simply cannot bear the smell.
I like cabbage, but the smell is rank. It's nothing compared to fish pie though <shudder>