The Artist: GZA
When He Quit Smoking: 2007
Why He Did It: During an interview with New York, GZA talked about growing up and said that weed has limited the amount of stuff he's been able to do in his career. "I'm done with that," he said. "I could have done so much more in the past...I'm just really, really laid-back-slash-lazy. Last minute with everything. And now, I can't blame the weed."