When a person smokes a cigarette, the body responds immediately to the chemical nicotine in the smoke. Nicotine causes a short-term increase in blood pressure, heart rate, and the flow of blood from the heart. It also causes the arteries to narrow. Carbon monoxide reduces the amount of oxygen the blood can carry.
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SMH I was going to answer it but ok
Explanation:
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More than 11 300 readers voted for the introduction of clean water and sewage disposal—“the sanitary revolution”— as the most important medical milestone since 1840.
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Medical milestones | The BMJhttps://www.bmj.com › content › medical-milestones
Doesn't lead to a productive end.
hope this helped :)