once you are adult you can claim “oh my freedom” and all that stuff… kids have no such luxury, it is on parents/teachers/community/policy/… to get them as best we can to adulthood and hence these two are not comparable. should we let kids snort coke during recess might be though (we don’t)
Banning something that you ban for adults as well is defensible. Insisting kids follow a standard of "healthy" that you won't apply to yourself smacks of hypocrisy and bullying.