In my city it's illegal to smoke in city parks, yet people do it inside my neighborhood parks nearly every day. Many times when young families with children are around and inhaling it second-hand.
Presumably this one is a lot easier to address inexpensively with a bit of tech. Smoking not so much. For one thing, people don't wear license plates.
The issue of loud vehicles can be addressed without resorting to things like facial recognition. Facial recognition, due to the obvious privacy concerns, should probably be reserved for much more serious things, such as catching fugitives or detecting violations of restraining orders and the like. Not people smoking outside. Maybe it shouldn't be used at all.
So I don't understand the complaint.