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Tobacco in cigarettes and cigars contains nicotine which constricts the walls of the blood vessels. Constriction means the vessel is narrower, requiring the heart to pump harder to push the blood through the narrower vessel, throughout the body, and back to the heart.

Because blood volume, viscosity, nutrient demand of tissues, and many more parameters are variable, our body needs a way to regulate blood pressure. One of the ways to regulate it is to make blood vessels larger or smaller in diameter, which is achieved by constricting or relaxing muscles around blood vessels. The brain has a centre for regulation of blood pressure, which is affected by nicotine. Also, the decreased amount of oxygen in the blood of smokers is a trigger for release of epinephrine (adrenaline) and constriction of blood vessels.

The nicotine from smoking gets into ones blood stream thus causing blood pressure to rise the more nicotine there is in the blood stream.

Because the chemicals in the smoke constrict your blood vessels, making it harder for the heart to pump blood to all of your body. It beats harder, which makes your blood pressure rise. Like a hose turned all the way up, but the nozzle is closed, eventually the hose will burst.

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