Smoking causes blood vessels throughout the body to get smaller, which reduces the amount of bloodflow to the penis. Even smoking just two cigarettes can prevent a sufficient erection. In certain studies, over 80 percent of men with ED were current or former smokers. Studies suggest that the effect depends on the amount a man smokes. ED is more than twice as common among heavy smokers than non-smokers.
Exercise can improve cardiovascular health and increase overall blood flow.
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