As society changes, sometimes normative signs have to change. Here’s an example:
This sign is posted by a restaurant patio in Philadelphia. Note that, just a year ago, such a sign probably would not have existed. Vaping — the use of e-cigarettes — just wasn’t a thing.
Interestingly, the relevant City of Philadelphia Ordinance doesn’t seem to mention vaping at all. It seems that someone has extrapolated from an ordinance about smoking to assume something very controversial, namely that vaping amounts to the same thing as smoking traditional cigarettes.