There’s literally a whole section on electronic cigarettes (part 6 since I’m assuming you didn’t read it). So it looks like there is regulation and it hasn’t worked as the kids are hooked on vapes. Many of these regulations also apply to vapes for example the health warnings on every package.

Regulations for vapes is also becoming more aligned with cigarettes over time. So from 2013 when they were introduced the increased regulation from the alignment with regulation on tobacco products hasn’t worked.

Further steps may curb this but from the data that is published on the number of those under 18 vaping I highly doubt it.

But thanks for elaborating :)