Motivation, rather than habit, drives addictive behavior in the face of adverse consequences and constantly changing circumstances, new research on rats suggests. For addicts to obtain drugs, it often requires considerable ingenuity and flexibility—behavior that should not be described as habit.

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Motivation, rather than habit, drives addictive behavior in the face of adverse consequences and constantly changing circumstances, new research on rats suggests. For addicts to obtain drugs, it often requires considerable ingenuity and flexibility—behavior that should not be described as habit.