Super Junior's Heechul revealed why he quit smoking on the November 11th episode of 'Knowing Brothers'.
The 'Knowing Brothers' cast members discussed how smoking was not permitted at sports stadiums starting from December 3 this year, and Heechul commented, "The reason I quit smoking is because my gums turned purple. They said that I couldn't fix the color of my gums."
He continued, "I smoked during my juvenile years, my bronchial tubes aren't good. That's why I can't eat hot noodles."
Good thing he quit!