One of my cats has coughing fits nirmally about once a day. She sounds like she's about to cough up a hair ball but never does. It's lasts about a minute and then she's back to purring quite happily but I can hear her swallowing quite frequently for a while afterwards. She did it in front of a vet who didn't seem overly concerned about it. Since having surgery to widen her nose she's not distressed by it. (Before that it was awful to watch her cough and try and breath as well). She's otherwise completely well. Videos of cats having asthma Attacks on YouTube are the same as what she does. But I've never heard a wheeze.