The road hasn't been easy and Ferguson shares his story with biting wit and brutal honesty: "I don't say this to try to impress you, but I was a bedwetter until around 11 years old, then I stopped, not for long, I started drinking alcohol regularly in my early teens, in which I returned to intermittent bedwetting until I was 29."
Ferguson explained, "The thing is when you drink alcohol the way I drank alcohol, it can have a spectacular and flamboyant effect on your bowels when you're asleep.
"It's one of the more attractive sides of active alcoholism, I think," Ferguson joked. "Occasionally I would wake up to someone, you know, and I'm trying to blame it on them. But it never really worked out."
Ferguson said he was a drunk for 15 years. He said he doesn't remember an exact moment when he realized things needed to change.
Ferguson said, "You know, people ask that - 'What was the moment?' I don't think there was -- 'When did you hit rock bottom?' For me it wasn't really like that. It's not that I hit rock bottom; I kind of lived there. I had a condo in rock bottom for a while."
He added he did have "hints from the universe" for a long time about his alcoholism.
"I was in a bar in Australia at 9:00 in the morning and the barmaid said, 'Geez, mate, but you drink too much.' You know, I'm thinking a barmaid who works in a bar in Australia that's open at 9:00 in the morning, is telling me that I drink too much, maybe I have (a problem) -- and I only drank for about eight years after that."
Ferguson said the difference between drinking and not drinking is like "night and day."
"I thought I had that whole bunch of problems. And so I drank to kind of alleviate them," he said. "That wasn't really true. I had one major problem with a lot of spectacular side effects. I had it the wrong way around."
Ferguson said he has thought about going back to the bottle, but hasn't.
"There are days I want to do things I don't want to do," he said. "Do you ever get an urge to do something and think, 'If I do that, that probably wouldn't work out well for me?'"
He told "Early Show" co-anchor Harry Smith he's started listening to his own voice.
Ferguson said, "Also I'm getting too old. I'm too old and cranky. I can't even take people yelling in the morning."
Ferguson's book also addresses his American patriotism.
"Like all naturalized Americans that I've met, I'm fiercely patriotic," Ferguson said. "America is a philosophy for me. It's a way of thinking; it's an aspiration, if you like. And so, I do love America very much. I'm very conscious of it."
The "Late Late Show" airs weeknights at 12:35 a.m. ET/PT on CBS.