Self-Initiated Recovery v.s. Forced Recovery: Comparing American Slavery to Addiction

Comparing addiction to bondage, the difference between someone deciding to stop on their own and someone having an outside authority stop them. The American South never came to the conclusion that slavery was wrong. How long would it have taken the South to eliminate slavery on its own? Brazil abolished slavery in 1888, almost in the twentieth century. The last holdouts are like the last smokers in a world that moved past cigarettes. How does this change subsequent history?