EXCLUSIVE: Dr. Drew On Brad Pitt Quitting Smoking Pot Because He Became A Dad

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."

Drew says the number one mistake parents make is admitting to their children that they did drugs. "I see it all the time with my patients. Parents tell their son/daughter that they did drugs, and then they warn them about the hazards of drugs. But in the child's adolescent mind, it's hypocrisy. Their parents did it, and they are ok." Dr. Drew says the only time it's acceptable to tell the children is if they, the parents, are in recovery.

Drew has specific advice for daddy Pitt when one the members of the Brangelina brood inquires about his pot smoking days. "Don't lie to your kids. The horse is out of the barn. Here is what I would tell him (Brad Pitt) to say I wish I hadn't said that, it would have been better for you to not know what I did or didn't do. The fact is why is here is why I think you shouldn't do it, or I would say I was so badly addicted I had to struggle with it, to stop to make sure I was available to parent you. It's an unusual situation with this public conversation."

Another concern Drew has for the Pitt children, are all of the moves the family makes. "Multiple moves are very destructive for kids. I can't say it's necessarily going to harm them. They never develop any stable relationships with their peers. It's very traumatic on many levels. A couple of VH1 programs coming up, some of the patients have moved 20 or more times."

The third season of Celebrity Rehab is set to premiere on VH1 in early 2010.