It smells terribly, exposes others to negative health effects without consent and is one of the biggest causes of littering. Simply put it is a major nuisance with no benefits apart from profits for the tobacco/drug industry and addicts getting their high.
Could probably extend that to anywhere around minors in general too.
These can indeed have negative health effects and are banned in many places, the latter at least after certain hours (noise complaints!). MOT inspection fails vehicles with excessively loud exhausts and in many places you can get a “rolling inspection” from a traffic officer on the road resulting in a fine or “fix-it” ticket.
Don’t have negative health effects on most people, though you can be asked to leave from many health care institutions if using too strong scents. Not really comparable to smoking but the argument could certainly be made.
Only causes death by second-hand embarrassment. Maybe not excessively scantily clad anime girls at a… kindergarten? but apart from that only emotions will be hurt.
And smoking is already banned in buildings, within 15 feet of an entrance of buildings, on buses, in parks, etc.