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There are many dangerous substances in cigarette smoke, but I will just discuss the most dangerous three of them.

Nicotine is a dangerous drug because it is strongly addictive, and it also causes blood vessels to contract (technically it is a vasoconstrictor) which reduces blood circulation.

Tar, also known as polycyclic aromatic hydrocarbons, is a powerful carcinogen; it causes cancer.

Carbon monoxide reduces the oxygen carrying capacity of the blood (it bonds to hemoglobin and prevents it from carrying oxygen molecules).

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Q: What are the dangerous substances found in cigarettes and why are they so deadly?
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