We take this opportunity to thank you for your patronage of Haneda Airport Domestic Terminal.

To eliminate the effects of passive smoking, smoking is prohibited throughout all restaurants in the passenger terminal.

Please used the smoking rooms at the designated locations in the passenger terminal.

Smoking room locations can be found here.
https://www.tokyo-airport-bldg.co.jp/en/service_facilities/other_service/smoking_place.html

Thank you for your support and cooperation.