2020s: >%2 of all teens smoke
Kinda suggests that putting limitations in place actually produces results. Crazy innit?
If you weren't aware, smoking became uncool a long time ago. Teens who consume tobacco use vapes or Zyn now.
So the metric should be case by case for each proposed solution. Most of things proposed are no good, but that doesn't mean there is not a sensible solution out there to limit net for teens.