Anything could happen LoL
I don’t think a smelt is big enough to eat a hopper, but fish LOVE grasshoppers and crickets.
I often used them this time of year for bait when I was a kid.
The best bait I ever used was black blood suckers...pick them out of the bucked with needlenose plyers and you can catch fish all day with only one or two...they don’t pull apart like worms and other bugs...catfish love them...