It would be a little ridiculous if The Queen's Gambit, set in the 60s, and Stranger Things, set in the early 80s, didn't have smoking. Those were some smoky damn decades.
It looked horrible, but games today are exactly the same with sports gambling. I wonder when the view on that will change.
Edit: I just noticed that some of the other show mentioned in the article also have this classification. So I guess this is not relevant.