In a recent episode of KBS Joy’s 20th Century Hit Song, Super Junior‘s Heechul expressed his regret of smoking when he was in school.

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While talking about hip-hop in the 90s and how singer Seo Taiji dropped out of school during a time when doing so was taboo, Kim Min Ah asked Heechul about his school days.

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And in response, Heechul revealed his biggest regret from his school days.

One of my biggest regrets is the fact that I smoked when I was in school.

— Heechul

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He even went on to describe the damage it did to his body.

That completely destroyed my bronchial tubes.

— Heechul

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According to Heechul, he confessed his before on MBC‘s Radio Star, and a screenshot of him making the confession ended up on the do-not-smoke sign at his cousin’s high school.

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Prior to this on a 2019 episode of SBS‘s My Little Old Boy, Heechul opened up about the pain of having bad lungs from smoking since a young age and even made the shocking revelation that he couldn’t eat hot ramen.

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At the time, Heechul announced that he hadn’t smoked for 10 years and that if he could go back in time, he would never start smoking.

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Watch the full clip below: