Under GB/T 22485-2021 and municipal public health regulations, what is the rule regarding smoking inside the taxi vehicle cabin?

1. Drivers may smoke if they roll down the driver-side window halfway
2. Smoking is strictly prohibited inside the vehicle cabin for both drivers and passengers at all times
3. Passengers may smoke if they offer a cigarette to the driver
4. Smoking is permitted during late-night hours when no children are onboard