(I don't smoke crack, motherfucker, I sell it)

from Big Sean (Ft. Jay Electronica & Kendrick Lamar) – Control Lyrics on Rap Genius

Meaning

As Kendrick also says on Nosetalgia he is strictly against most drugs, so he won’t touch any of it, even dope. Kendrick is saying that his music is so good and addictive like dope that people have to buy it. His verses, what he represents, its like crack to all these people in the world.

This is also a flipped version of a line that Eminem used in Weed Lacer:

Bitch, I don’t sell crack, I smoke it

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