Lagos, Nigeria — One evening in July 2020, Seun [last name withheld], wearing his favourite vintage shirt, a baseball cap and sneakers, boarded a minibus from his home in Mushin to celebrate his 28th birthday with friends at Eleko beach in Lagos.
Midway between the drinks at the party, one friend brought out some balloons from a bag and a blue canister to inflate them. Soon, the entire group was sniffing the balloons.
