I will sometimes get a coughing fit, but it's usually after waking up. I have bad post nasal drip and I will cough up phlegm. Once I get it out I'm fine.
Also, smokers can get coughing fits because smoking kills the cilia in the trachea , especially when they first wake up.
When my allergies act up, I can also have coughing fits. Or just when it's very dry, or when I'm taking meds (antihistamines) that dry out my mucous membranes.
However, I do understand everyone wanting to call 911 thinking this person is dying. But, imagine their embarrassment that they can't control the coughing and bringing attention to themselves.
Just giving another perspective.