“For years almost every new, hyped rapper rhymed about selling drugs. Now young artists are rapping about taking drugs, and lots of them. This shift can probably be traced back to Lil Wayne, rap's mega-superstar whose boom in popularity coincided with a shift in persona from coke-pushing spitfire to free-associative weed-chimney. Or it could be Kanye West, not a drug user per se, but whose rise amo”