I acknowledge that smoking tobacco can lead to various health problems. This today is widely known. Anyone who claims to not know has not been paying attention.
Specifically, the bad effects of smoking arise from first hand smoke. As in, I choose to smoke a cigarette and I am inhaling the smoke into my own lungs of my own free will.
So let’s get to the other stuff.
It has gotten to the point where smoking anything is disallowed nearly everywhere. So I think we have unfortunately moved far beyond what is protective of public health and into a new phase of social disapproval.

Specifically, I wonder why smoking is explicitly disallowed in places where it won’t harm anyone other than the smoker. Outdoors is my primary example. Who is being protected when smoking is forbidden outside and away from other people?
There are legitimate concerns about second hand smoke when the smokers smoke all day in enclosed spaces such as a car or at home, and the nonsmokers have no choice but to regularly breathe the smoke into their lungs.
That is not the case outdoors. Smoke blows away on the wind, yes? It is dispersed, becomes less concentrated. So unless you are sitting outside within a few feet of a smoker who is blowing smoke directly into your face, I don’t see that there is a problem.
And if a smoker is blowing smoke directly into your face, that is extremely inconsiderate and you have every right to ask them (tell them?) to stop. It is basic manners and social intelligence.
So back to the ban on outdoor smoking. Why is that a thing? Perhaps it’s because those in charge of such outdoor spaces feel that people cannot be trusted to self-police their own smoking with civility.
Honestly, common courtesy does seem to be diminishing these days, as more and more people think it’s okay to issue death threats when they have a simple disagreement. Maybe making a blanket ban just removes the potential for violent dispute.
But we are dangerously close (if we’re not there already) of moving from legitimate social disapproval for the sake of public health* to a moralistic society where smokers are seen as flawed, dirty people.
Maybe that’s what was intended all along. I don’t know. But it’s never a good idea to make an entire class of people somehow less human. We’ve seen where that can lead and it’s nowhere good.
*Legitimate social disapproval for the sake of public health includes the disapproval of, among other things, poor personal hygiene (not washing hands, defecating outdoors, etc.), not wearing seat belts in motor vehicles, not wearing face masks to prevent the spread of infectious disease.