J was the solo debut album of Jaehyun, member of the South Korean boy band NCT. SM Entertainment released the record on August 26, 2024, through Kakao Entertainment. The album contained eight tracks, with Smoke as its title track. Jaehyun thereby became the fourth NCT member to make an official solo debut. Alongside Smoke, songs such as Roses, Flamin' Hot Lemon and Dandelion also appeared on the tracklist. An English-language version of Smoke closed out the album.