Let the senile old f*rt be. If he was practicing medicine 60 years ago he has to be 90+. And if tobacco smoke cured asthma there would not be anymore asthma. If that simple solution worked everyone would be pumping smoke into their asthmatic kids rooms. As far as my asthma in concerned, I didn't know what caused it until I moved out of my parents smoke filled house and it went away.
And if tobacco smoke cured asthma there would not be anymore asthma.I never said tobacco smoke "cures" asthma.
In my sister's case, it stopped the onset.
As with many things, interrupting the onset mitigates a full-blown problem.
The evidence is anecdotal - less smoking, more childhood asthma.
Draw your own conclusions.