I’m of many minds on the issue. I don’t smoke, but my grandparents did (sometimes around us), and my mother and step father did (although they tried very hard not to do it around us). It absolutely contributed to the early death of two of my grandparents as well.
I think that overall the health consequences for the direct users could be managed via various legislation, and I’m glad I’m young enough that most of memories eye-watering, smoke dimmed family restaurants are generally with age.
Still, second hand smoke is a real and lingering problem. I’m sure we’ve all seen it, that the rules tends to be enforced… unevenly. Every workplace and public area I’ve been has signs about “no smoking within X feet” and every single one has been disregarded with minimal if any enforcement. So we’re all far better off (well non-smokers) than even my personal memory, but still suffering despite the existing laws.
Honestly, despite my wishes for a perfect world (and boooy do I have a long list), I think that especially in the US, the reactionary efforts against even such a time-derived ban would result in unspeakable scorched earth state-by-state refusals. Not to mention refusal to enforce such laws that would make the conflicts of MJ legislation look tame. No, I think even slow acting bans are doomed for at least another generation, but as outlook and markets change, it should be kept as a viable possibility 15-20 years down the line perhaps.
However, I see few to any problems (again borrowing from MJ legislation) to once again increase state and/or federal taxes on all tobacco products, to be applied to research on cancer, or some other largely non-political public welfare benefit. Not so high as to lead to a de facto ban (and to prevent the rise of large scale black marketing) but enough to subsidize some of the societal costs and even save a few smokers!
IE instead of say, $8 a pack (which seems to be roughly the average right now), if it were $10 a pack, you might get smokers to cut down even just one a day, to make a pack stretch farther. It wouldn’t help much, to be sure, but I don’t see a great deal of harm at the same time.