Black Lungs is a side project of Alexisonfire's guitarist and vocalist, and current Gallows frontman Wade MacNeil. Wade created the side project reminiscent of his first punk rock band Plan 9. Black Lungs has also included Alexisonfire's George Pettit on bass, and Bedouin Soundclash's former drummer, Pat Pengelly on drums. The side project released their first studio album, Send Flowers, May 20, 2008 on Dine Alone Records and toured afterwards to support the album.
On March 8, 2011, Wade announced a Split EP with fellow Canadians, Cancer Bats. On April 3, 2011, Black Lungs confirmed that they will begin recording their second album on Friday April 8, with producer Nick Blagona. At the same time, they announced that the new album will be entitled "Pagan Holiday" and will feature 16 songs.