In 1966 Walton successfully underwent surgery for lung cancer. Until then he had been an inveterate pipe-smoker, but after the operation he never smoked again. While he was convalescing, he worked on a one-act comic opera, "The Bear", which was premiered at Britten's Aldeburgh Festival, in June 1966, and enthusiastically received. Walton had become so used to being written off by music critics that he felt "there must be something wrong when the worms turned on some praise." Walton received the Order of Merit in 1967, the fourth composer to be so honoured, after Elgar, Vaughan Williams and Britten.