50 Cent has criticised Nas for being too smart for business. 

The rapper claims Nas' core fans are turned off by the fact the rapper is too bookish and not street smart. 

50 tells rap magazine XXL, "You have people that are extremely book smart that lack common sense, so they don't know what's going to affect their audience. They have more information than me based on reading.

"For instance, Nas is a really smart guy. He reads books constantly. We were around him on the Nastradamus tour. He was almost weirder than me 'cause we would go to breakfast and he'd be there reading a book. 

"Conceptually, I think that's what made him drift away from what his initial audience enjoys from him and why he's not hot right now."