The number of smokers back then was always vastly under-reported, because it was all about self-reporting. In my school nearly everybody smoked, at least women

The number of smokers back then was always vastly under-reported, because it was all about self-reporting. In my school nearly everybody smoked, at least women and girls did - I counted them. 87% of the girls in my school smoked. There would be one or two in each class who didn't, but everyone else did. Still, most of them would say they didn't smoke, if you asked them - because they didn't smoke all the time. So the official number was something like 30-40%, a completely fake number. (These days things are different, fortunately. I don't see many young people smoke anymore, but the mentality was completely different back then, around the time when it was still allowed to smoke indoors everywhere)