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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.
The Long-Term Effects of Alcohol on the Body. Long-term addiction can take a heavy toll on the entire body. Alcohol can impact the heart and cause cardiomyopathy, arrhythmias (Irregular heart beat), stroke and high blood pressure. The liver takes the brunt with repercussions including fatty liver, alcoholic hepatitis, fibrosis and cirrhosis.