In his new book, Cake Eater, Carl Radke fills in some gaps for Summer House fans about his battle with substance abuse and beyond. The 40-year-old reality star's memoir, out Tuesday, December 30, chronicles how he got sober after years of partying on and off screen. He reveals he tried cocaine for the first time in college, more than a decade before he revealed his addiction on Bravo. "It's so easy to see the red flags now," he wrote of his early days of partying at Syracuse University. "Blackouts were becoming increasingly frequent.