The Artist: Lil Wayne
When He Quit Smoking: 2010
Why He Did It: You can't smoke behind bars! And even though he's out now, Weezy's still on probation. So he's not allowed to partake in pot anymore. But we're not so sure this drug-free thing is for good. "I drank syrup and smoked a lotta weed," he told GQ last year. "I wish I could be back on it. That's how it f------ feels. How does it feel to be sober? I'll be like, 'It feels f----- up.' What do you want me to say? 'It feels great'? No."