This topic was brought up recently, so I dragged up this. Good info on here.
I have read that a lot of our american neighbors chum big time (when legal). I have read where 5 + GALLONS of corn, rice, oats etc is dumped down a hole in some deeper lakes to attract and hold fish in an area . They say some of these bays literally smell like corn chowder after the ice goes out.
It's used for a variety of fish and you would think such widespread use would kill every corn eating fish in the water if it was real harmful.
I have found no solid info on this yet(didn't look that hard though).
My thought would be that a few pieces as bait wouldn't be too harmful.
Good luck with whatever bait you use,
Ken