Is the concern just that the activity is nominally unlawful? Or that it will be a “gateway drug” (is there any evidence of that)? Or that it is a waste of students’ time? Or ...
Or are we worried about stimulants in general? Or is there still some significant cancer risk from vaping? (Are people freaking out about high school students drinking too much coffee?)
If students are just replacing cigarettes with vaping, that seems like an unambiguously positive development.