The Artist: Snoop Dogg
When He Quit Smoking: 2002 (er, at least temporarily)
Why He Did It: Although we're pretty sure Snoop's picked the habit up again—he got arrested for pot possession in January—there was a time when he quit. "I'm not trying to be a dead legend," he said. "I'm trying to be a living legend. I care about myself and I love me and I wanna be here. I don't care what you say or what you feel. If you have something negative to say about me not smoking weed, f--- you in your mouth."