Earlier quoted context omitted.
Time to read up on how NZ implemented it. Already smoke, even if incidentally? You're 100% unaffected, you can still buy them until you die from old age. Too young? Cool, you're never going to get ciggies sold to you, and you're not going to miss suddenly no longer have access to them because you never did anyway. No one loses. It's a very long term solution, and one that (the current forms of) the US or Europe could…
There are a lot of people who insist that prohibition never works. I wonder if this is successful it will change their minds.
They will see the microscopically minuscule number of people who still smoke due to the black market and claim the entire effort to be an abject failure.
They will ignore the millennia of higher quality lifespan added to the population, the massive savings in public healthcare expenses, and the almost-non-existent second hand damage smoking does and just focus on the thousand or so people smoking smuggled cigarettes.
When you suggest that their position is somewhat analogous to not passing laws against murder because "well that dude over there got murdered so OBVIOUSLY the laws aren't not working" they will just look at you funny.