US has gone to a minimum age of 21. I actually think that’s enough, along with raising the price and reducing the number of places people can smoke.

People generally start smoking by their teens or not at all. Making it hard for kids to get exposed to nicotine will stop a lot of addiction.

Also way fewer parents have cigarettes in the house so it’s harder for kids to grab them at home. And there are pretty strong taboos nowadays about giving random kids stuff they’re not supposed to have.