Chocolate Milk Addiction? Good or bad?

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I have found myself drinking half a gallon of chocolate milk every other night and I don't know if this is a healthy habit or not.. I know milk is good, but also chocolate is not that good for you. And it's a LOT of milk at once. Half a gallon every other night! I could stop if it isnt good for me, but I don't thin it's all that big a deal. I just don't know. Any opinions on this curious circumstance would be most appreciated.