Sadly lots of young people smoke in Denmark. Earlier stop smoking campaigns were very successful and because of dropping numbers of smokers campaigns were toned down - so the current generation smokes like chimneys. They’re called the lost generation even. It’s supremely stupid.
Here in the Bay Area, California, I have gotten so used to no one smoking at all anywhere. People do, but it's not common. I did hear from someone that in the last two days, since recreational marijuana became legal, that THAT is the main smoky smell on the street of San Francisco.