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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
emily_xoox. If you drink alcohol properly, it tend to have a calming effect on the body. But if you chronic drink alcohol or drinking too much alcohol, it will cause the stimulation of your body chemicals and hormones because of the increasing adrenaline flow. And that will cause the dilation of your pupils.