Laughing gas ban questioned after police seen failing to intervene at Notting Hill CarnivalA young woman with a bright yellow balloon in her mouth giggles as a police car pulls up beside her. Next to her in the Fiat 500, her friend inhales nitrous oxide gas (nos) from a blue balloon.
Source: Laughing gas ban questioned after police seen failing to intervene at Notting Hill Carnival (https://news.sky.com/story/could-laughing-gas-ban-be-pushing-people-to-more-dangerous-drugs-13205091)