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childhood health concerns 1  child hood obesity 2 drug abuse 3 smoking  How do e-cigarettes affect the brain? The nicotine in e-liquids readily absorbs into the bloodstream when a person uses an e-cigarette. Upon entering the blood, nicotine stimulates the adrenal glands to release the hormone epinephrine (adrenaline). Epinephrine stimulates the central nervous system and increases blood pressure, breathing, and heart rate. As with most addictive substances, nicotine increases levels of a chemical messenger in the brain called  dopamine , which affects parts of the brain that control reward (pleasure from natural behaviors such as eating). These feelings motivate some people to use nicotine again and again, despite possible risks to their health and well-being. Health Effects for Teens The teen years are critical for brain development, which continues into young adulthood. Young people who use nicotine products in any form, including e-ciga...
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