According to a new book by famed celeb biographer, pot-puffing Brad and paranoid Angie‘s temper are fueling a marriage bent on destruction with "scary" fights.

In new book Brangelina: The Untold Story of Brad Pitt and Angelina Jolie by Ian Halpeirn, who claims to have spoken with 900 sources, Brangie may have been brought together by wild sex when shooting Mr & Mrs. Smith but when the bloom was off the rose, their marriage turned nasty.

"Brad had never had such incredible sex," Halperin told the NY Post. "My sources say that they sometimes spent 18 to 20 hours a day in bed. But sex eventually wears off."

Halperin writes that now the couple "argues like cats and dogs — everything from politics to clothes the kids wear and Brad’s ‘atrocious habit,’ including pot smoking and alcohol."

"I talked to several people in Brad’s family who wished they’d break up today. They’re scared for Brad’s safety and his well-being," he says.

Nothing new to ENQUIRER readers as we first broke the story about Angie’s rage over Brad’s hash-hish party with Inglorious Basterds director Quentin Tarantino months ago and Angelina’s explosive response. 

The ENQUIRER has been consistently detailing Brangie’s private war behind closed doors and their seemingly calm and unified façade to the public ever since Brad’s bust-up with wife Jen Aniston to go off and play daddy to Angelina’s ever-growing mixed family of conceived and adopted brood.

"I’ve heard that they’ve broken up so many times it would make your head spin," a source who worked with Pitt on the sword-and-sandal epic Troy told Halpeirn.

"There are apparently screaming matches, usually with her doing the screaming. Nobody really witnesses that part of it — they just see him leaving in a huff.

"But then he ends up coming back again, and nobody knows what happened to bring him back."