Jeff Conaway is mostly famous for starring in Grease and Taxi — oh yeah, and for having a terrible drug habit. The good news is, he’s recovered: And not by going on VH1’s Celebrity Rehab with Dr. Drew. Surprising, right? If a reality show can’t cure you, what can? His answer: Scientology. Jeff said he was introduced to the religion by former co-star John Travolta: “He couldn’t watch me going down the tubes.” Also: He couldn’t have found a more vulnerable person to brainwash. “My doctor wa

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