How to help cat when she coughs?

She doesn’t have asthma she’s just fat so she will have a little coughing fit once in a while. It’s never more than once in a day and she usually goes a few days without coughing so it’s not serious enough for me to consider an inhaler. If she keeps coughing when the weight is off I’ll get one. I’m just wondering if there’s any way to comfort or ease the coughing a bit? Does rubbing on her back or neck help?