There is a difference that someone smoking nearby automatically harms people around you. With alcohol, the effect is more unpredictable, but it is equally real.
Alcohol is a factor in an automobile crashes, and a factor in a significant proportion of violent crime, especially domestic violence (https://www.cato-unbound.org/2008/09/17/mark-kleiman/taxatio... edit: this source isn't as great, Kleiman has written elsewhere about the subject, but google is failing me). If we could wave a magic wand and cause drinking to cease to exist, many lives would be saved.
Note: I do in fact drink, I am not a teetotaler. But what I said above is factual. I personally believe that prohibition would be worse, and it's reasonable for individuals to make their own choices. But that does not entail denying that it goes very badly for many.