"Father's death made Obama realise he could do more with his life than smoke pot Michelle tells Jon Stewart."

A Daily Mail headline. Details:

On the Daily Show, Stewart joked that the stories about the president as a young man resembled the 'script of a Cheech and Chong movie.'

While the First Lady didn't directly address the claims in Maraniss' book, she did say that her husband underwent a change during his college years.

Mrs Obama responded by saying: 'By the time he was in college, like so many young people, he realised that he could do more with his life.'

'He had a mother that was always saying you're so gifted, you're so talented, slap him on the head, "get yourself together."'

Watch the clip at the link. After she gets that far and Stewart tries to push her farther, she says "I'm not taking the bait," and Stewart says "Don't worry. It's organic."

By the way: "slap him on the head" seems to take domestic violence as a joke.