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Difficulty in cessation of drinking, smoking, or gambling has been widely recognized. Conventional theories proposed relative dominance of habitual over goal-directed control, but human studies have not convincingly supported them. Referring to the recently suggested "successor representation (SR)" of states that enables partially goal-directed control, we propose a dopamine-related mechanism that makes resistance to habitual reward-obtaining particularly difficult. We considered that long-standing behavior towards a certain reward witho