My best observation has been my being on a college campus on a regular basis for 30 years. Twenty years ago I would say that 40-50% of the students were at least social smokers. Today, I doubt that number is even at 10%.
It's been my observation as well. The campaign to socially ostracize smokers has been very effective. As mentioned in another post, I smoked for 30 years before quitting cold turkey in 2015. Haven't touched nicotine in any form since.
When I joined the Navy in 2003, damn near everyone smoked. These days there are very few smokers left (and about half of those people vape). There is a constant drumbeat over smoking cessation and health-awareness.
When the campaign to ban smoking indoors was in full effect, you could always find people outside the entrances puffing away. I rarely see people smoking in public anymore. I remember being a smoker stationed in San Diego. I started leaving my cigarettes at home when I went out because the ugly looks I got from people when I smoked outside made me feel uncomfortable.
Sorry for the ugly look, but that was just my normal face.