Sean Penn Smokes Several Cigarettes on ‘The Late Show,’ Says He’s on Ambien: Watch!

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Sean Penn made himself right at home on Monday's Late Show.

The 57-year-old actor started off his interview with host Stephen Colbert by getting extremely candid. “I’m doing well. You’ve inherited a little bit of the Ambien I had to take to get to sleep after a red eye last night,” he admitted, agreeing with Colbert that he was on the “Ambien train.”

“I’ve interviewed you before. How do you tell Sean Penn on Ambien from Sean Penn not on Ambien?” Colbert quipped. “Because you lay back in interviews in a really big way.”

“I think it’s pretty much the same,” Penn noted, while pulling out a pack of cigarettes and lighting one up. “There’s a lot of times I’m just regular tired.”

Penn smoked several cigarettes while on stage, and when Colbert asked him to stop for the sake of his own health, Penn jokingly replied, “This is job security for oncologists.”

Colbert also asked the two-time Oscar winner about his recent revelation on CBS This Morning that he plans to step away from acting.

“The greatest thing that an actor can bring to the party is to play well with others – it’s the collaboration,” Penn explained. “And I increasingly don’t play well with others and so it becomes less enjoyable. I love that process when I love it, but I’m not loving that anymore. And that’s really why I finally came out to writing a novel.”

Penn is currently promoting his first novel, Bob Honey Who Just Do Stuff, which is about a septic tank salesman-turned-assassin who kills people with a mallet.

For more from the eccentric actor, watch the clip below!

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