Hollywood star Bradley Cooper said he once felt his struggle with drug and alcohol use would cost him his life. `The Hangover` star, 48, had an open and honest conversation about the lowest points in his life in a recent episode of the hit National Geographic series `Running Wild With Bear Grylls: The Challenge`, reports nypost.com.

“You definitely had some wild years?” famed survivalist Grylls, 49, asked the actor in the rugged canyons of the Wyoming Basin. “In terms of alcohol and drugs, yeah, but nothing to do with fame,” Cooper said. “But I was lucky. I got sober at 29 years old, and I’ve been sober for 19 years. Very lucky.”