Michael Phelps' immense lung capacity helped him to become the most decorated Olympian of all time - and it also makes him quite the smoker, apparently.
Wiz Khalifa opened up about sharing a joint with the swimming great on The Rap Caviar Podcast, saying that Phelps has 'Aquaman's lungs'.
Watch him recount his smoking sesh with Phelps here:
Speaking about blazing up with Phelps, rapper Khalifa said: "He was super chill. He just kept walking up to me like, 'This weed is amazing.'
"He was like, 'I feel like I'm floating,' and I wanted to make a swimming joke, but I was like, 'I'm just gonna keep that to myself.'"
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He added: "That dude's got like Aquaman's lungs bro... The weed inhale - he's like smoking a joint in two puffs."
Phelps hung up his goggles in 2016, having won 28 Olympic medals, meaning he can now smoke to his heart's content.
That said, the 37-year-old did get photographed smoking a marijuana pipe relatively early on in his career.
The News of the World published a photo of him smoking from a pipe back in 2009, and he was forced to issue an apology.
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He said: "I engaged in behaviour which was regrettable and demonstrated bad judgment.
"I'm 23 years old and despite the successes I've had in the pool, I acted in a youthful and inappropriate way, not in a manner people have come to expect from me.
"For this, I am sorry. I promise my fans and the public it will not happen again."
But according to Wiz, it sounds like Phelps has most definitely reintroduced weed into his life - except nowadays he is all grown up and retired and doesn't have to worry about USA Swimming getting on his case.
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The governing body banned him for three months after the photo was published, as well as withdrawing financial support.
"USA Swimming has reprimanded Michael Phelps under its Code of Conduct by withdrawing financial support and the eligibility to compete for a period of three months effective today, February 5, 2009," a statement read.
"This is not a situation where any anti-doping rule was violated, but we decided to send a strong message to Michael because he disappointed so many people, particularly the hundreds of thousands of USA Swimming member kids who look up to him as a role model and a hero.
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"Michael has voluntarily accepted this reprimand and has committed to earn back our trust."
Hopefully the fact he went on to become the most decorated Olympian of all time is considered sufficient redemption.
Jake Massey