My blood is colder
Niggas respect violence so I become it
I'm from it, I even done it blunted so run it

from Nas – One on One Lyrics on Rap Genius

Meaning

Nas is explaining the nature of people in the black community from a sociological perspective, specifically the idea that citizens are a “product of their environment.”

Essentially, this excerpt describes the notion that putting people in a different setting or scenario will have little to no effect on their basic instincts and behavior. The rottenness surrounding him is uncomfortable. It made him colder, meaner, crueler. The only way to gain respect/survive would be to accept the evil and become it. It’s what makes him because its what he grew up on.

“I even done it blunted so run it” could refer to being violent even while blunted. Even when you’re trying to relax in the rotten apple you have to be on your toes and be willing to get violent if necessary.

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