it would we mandatory digID

I'm a (light) smoker, and I do get the point of a generational ban: there is almost no benefit to tobacco usage, it's a thing you do just because you did it before. Alcohol and drugs, as dangerous as they might be, do provide relief and entertainment. In the case of tobacco, people who never did it never miss it, nor they miss any particular experience that comes with it. Of course, for smokers is a pleasure- but it's surprising how the need itself- and most of the pleasure you get by satisfying it- simply disappears if you can keep yourself from smoking for a while. Tobacco is simply a parasite of human beings, exploiting their nervous system for its reproduction.