Did my aquarium gravel kill my fish???

i bought this artificially dyed,blue,aquarium gravel & i suspect it has killed my fish.i never noticed till it was too late but it smells like toxic plastic.has anyone experienced this?
Update: yes & the gravel was bought from a pet store.it was specifically made for aquariums.
Update 2: yes & the gravel was bought from a pet store.it was specifically made for aquarium use.
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