Are these the same kind of rice cakes though? Remember my parents buying rice cakes from a Chinese supermarket when younger that were not the dry crunchy type we think of, but smooth solid blocks, a bit like polenta but smoother. I can see someone choking on the latter, but not the former.
Just goggled this as my DD1 loves them, 9 people died after eating the mochi rice cakes which are completely different to ours. Apparently they are quite sticky and gooey. I think we're fine. Having said that my DD chocked on banana last week so always a good idea to gave your first aid up to date so you know what to do.