WATCH: Hannity caught vaping live on air

Hannity did not seem to realize the cameras were live. It appeared in the video as if someone on set got Hannity’s attention, at which point he removed the vape and threw it aside. Hannity smiled at the camera and then said, "Uh oh."

The moment happened as Hannity was about to begin his final segment 'Villian of the Day,' where he discussed Reps. Adam Schiff and Eric Swalwell and the ongoing saga with Chinese spy Fang Fang.

Fox News host Laura Ingraham teased Hannity about the candid moment. "Oh wait, am I on camera right now?" Ingraham jokingly asked as she drank from a water bottle in a reference to what just happened.

"It happens to the best of us, Hannity," she continued. "I mean, those little moments are cute, those are in the forever reel of the real Hannity, like, we want to know you."

Hannity replied with a story about his son thinking it was cool that he made it onto a Barstool Sports video because of his e-cigarette while his daughter thought it was humiliating. "Can’t please everyone," Hannity said.