Once when I was a kid, mom had a birthday party with strawberry cake and barbecue potato chips. That was the day my system decided to get a particularly virulent (almost violent) strain of stomach virus. I still remember puking off the side of the porch over and over.
For about 14 years after that I was not able to even smell artificial strawberry flavoring or barbecue potato chips. I still loved strawberries, strawberry jam, anything that had real strawberries in it, and barbecue was still delicious. It was just artificial strawberry flavoring in anything, and barbecue potato chips. They would make me feel nauseous.
Eventually it cleared up. I can eat artificial strawberry flavoring and barbecue potato chips again without feeling even slightly queasy.