It is dimly possible that your asthmatic friend is one of the small percentage of the population who is actually benefitted from nicotine.
When I was very young, I had severe asthma, so bad that my parents were considering relocating from Chicago to Arizona or somewhere dry simply to save my life. And, when I was five, the family got moved by my father's company to Genoa, Italy. In Genoa, I was exposed to all sorts of filth and grime plus lots of crud in the air (Genoa is the Gary, Indiana, of Italy).
I got somewhat better in the first few months we were in Genoa. But what really improved my breathing was when I was taken to an Italian pediatrician. Bear in mind, this doctor was about 60 at the time, which meant he got his medical training, etc., at around the turn of the century (nineteenth into twentieth, not the recent one). In post-World War II Italy, the standard of care was to teach the child how to inhale tobacco cigarettes. (They call it the "practice" of medicine because they haven't got it quite right yet.) So, at age five, I smoked my first cigarettes under the supervision of an MD.
Needless to say, my parents were aghast, and I got a new, more modern, doctor pronto. But the relief of that cigarette was magical -- I can still remember it, sixty years later. Ever since then, I made a point of keeping close to smoking adults whenever I could, and I could feel some relief.
And, whenever I tried to quit smoking as an adult, within days, my asthma would get much worse. Patches and nicorette gum never helped: apparently, I had to have the nicotine in some sort of aerosol form. When I switched to vaping, I had no problem other than "Quitter's Flu," which just felt like a cold.
As an adult, I've never used an inhaler, but I'd always had a problem with exercise- and cold-induced asthma. That seems to have gone away after two years of vaping. For the first time in my life, I can tote heavy things and do work in the cold without practically collapsing from coughing fits.