I assume the seat had a fabric cover, which might have been glued on with something fumaceous.
All my neoprene has smelled simply like neoprene, nothing strong or sickening. It loses intensity with time, airing, and use anyway.
It's also possible that the seat was stored with strong odors from something else and absorbed the fumes.
Bent Shaft Canoe Paddles
Touring Kayak Paddles
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