Some of us are old enough to remember these changes. LOL.
I never flew during the days of smoking on a plane. I can't imagine how much I would have hated that.
It was awful. And plain old silly how it was done. The last row(s) of first class were smoking sections, and the last rows of coach. Non smokers were literally surrounded by smokers. That works. On long cross country trips, it was disgusting. I did it quite a bit in early days of my travel heavy job. 3-4 days a week. Ugh.