Dr. Drew Pinsky -- board certified addiction specialist & host of Celebrity Rehab -- has some advice for actor Brad Pitt who recently revealed to Bill Maher that he no longer smokes marijiuana because he became a father.

Dr. Drew tells RadarOnline.com exclusively, "You have to wonder how much pot Brad was smoking. Was it a chronic problem? I don't know. But to the extent that he had to quit because he felt it was interfering with his parenting abilities is bothersome."

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• The Mirror Effect How Celebrity Narcissism Is Seducing America