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Cigarettes contain nicotine that increases heart/pulse rate. When the heart rate is increased, there will also be an increase in the blood pressure (BP). Cigarette smoking increases the tendency of the blood to clot so the blood will be more viscous (malapot) and has higher tendency to coagulate (mamuo), causing blockage and eventually atherosclerosis.

Another effect of nicotine is it makes your blood vessels tighten (vasoconstriction) thus the blood flow will be restricted and will result to higher pressure.
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