Jack Nicholson JNICHOLSON041505_05.jpg Jack Nicholson's been a devoted smoker for most of his life - but to hear him talk about it now, he's wishing he'd never picked up the habit!

Extra reports that the Tinseltown legend touched on the subject while talking to the LA Times yesterday, describing smoking as "stupid" and professing to be afraid of the effects his pack-a-day routine has had on his body.

"The real fear," Nicholson is quoted as saying, "is going through now the process and thinking, 'I'm dying of stupidity.'"

Hey, no argument from us there!