Role of dopamine in our experience of reward and pleasure

What is the role of dopamine in our experience of reward and pleasure? Question 2 The video suggested the dopamine may not produce the experience of pleasure, but instead anticipate pleasure/reward. What implications does this have for addiction? What might this mean about "triggers" for addiction or about cravings for a drug? Have you ever had a strong craving for a food, but found yourself disappointed with the actual experience of the food? How could we explain this mismatch of craving and actual pleasure in terms of what we know about dopamine?