The double whammy is that alcohol is an extremely calorically dense substance.
Even worse, it is consumed in liquid form, which also bypasses some satiation mechanisms in the body.
There's a reason tour de France riders get most of their replacement calories in liquid form
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Indeed the average base spirit has 2-3 calorie per millilitre. This is 5-6x the amount found in coca cola or pepsi. But then again, the quantities are also much less than when drinking soft drinks (hopefully).