The gum is supposed to be chewed for a short while, releasing nicotine, then “parked” for a while while the nicotine is absorbed. A nonsmoker may find the ritual strange, and just chew. I would guess that a nonsmoker would end up with a headrush, some heartburn, and the hiccups. (No minor hiccups, either…) And possibly physically nauseated. I’m on the gum, by the way.