> Preventing children from smoking has entirely to do with the very well established and understood health impacts on children as they develop, same as alcohol.

There are very well established and understood health impacts on adults too, for both smoking and alcohol.

> It is not because of secondhand smoke. The latter informs where we can smoke, such as (not) around a hospital.

Duh? I mentioned second-hand smoke in the context of "public smoking bans," by which I meant smoking in buildings and other public areas. That has nothing specifically to do with children. So it appears that once again you misunderstood my comment.