Super Junior's Heechul revealed why he quit smoking on the November 11th episode of 'Knowing Brothers'.

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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!