I suspect that most of the reason it seems that everybody is smoking is that the stigma (and concrete consequences) of being known to smoke are dropping so more

I suspect that most of the reason it seems that everybody is smoking is that the stigma (and concrete consequences) of being known to smoke are dropping so more people are willing to admit to it. It's legal for me to smoke, but I don't. Ten years ago it wasn't, but I could have if I were inclined. I don't think that legalization efforts or the like are really increasing the number of people who smoke, either you want to and did regardless, or you don't anyway. Maybe there was a temporary drop in the number of smokers before the kids that grew up on D.A.R.E. learned how to use the internet (and subsequently learned that no, pot won't kill you with just one hit...), but otherwise I would hesitate a guess that we are still around 1960's level consumption.