The right to nullify

Radley Balko has an interesting piece on jury nullification in drug cases. I'm torn. On the one hand, you have to obey the law even if it's a bad law--unless it actually requires you to do something monumentally unjust. On the other hand, laws preventing people from deciding what they can do with their own bodies are pretty monumentally unjust, and they have massively increased the incarceration rates, and subsequent unemployability, of poor black men--so how could I follow the law and help perpetuate that injustice?