I gave my hamster some corn, will it choke?

Ok so yesterday, I gave my hamster (it's a little white dwarf hamster, probably a winter white) 2 kernels of plain, hard corn (the kind that you use to make popcorn) and he gobbled it right up, with no problems. Bu then today i heard that hamster choke on corn so now i'm really worried, i've only had him a few days :/ there haven't been any signs of any problems, like he was perfectly fine in his exercise ball today, but i'm worried i could have harmed him... PLEASE HELP! also are hamsters ok with oatcakes?