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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.
This is excellent news for those with high blood pressure or conditions like glaucoma. In fact, the ability of cannabis compounds to open blood vessels is why the herb causes red eye and dilates pupils. Cannabis can also increase your heart rate by two times for up to three hours after consumption. However, this effect will vary significantly from person to person. In some, heart rate may only increase by 20%.