People born after a certain year is a class of people. Born on one side can smoke, born on the other side can never smoke.

But it's good for them! Sure. They also speak about smoking being a problem for the Maori. Maybe they should start by banning them from smoking.

They aren't banning a drug preference. They are banning it from a specific group of people.

This is fundamentally broken. There has to be a better way of accomplishing it than setting terrible precedent of yanking privileges for life from a group which can't even vote yet.

How many upper-middle class people do you know who smoke cigarettes?

A lot of them surely snoke hookah or vape, and laws rarely make difference between that and smoking.