Tobacco smoke contains carbon monoxide which

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(A) Tobacco smoke contains carbon monoxide $(CO)$.$CO$ has a much higher affinity (about $200-250$ times) for haemoglobin compared to oxygen $(O_2)$.W

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Reduces the oxygen-carrying capacity of blood

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(A) Tobacco smoke contains carbon monoxide $(CO)$.$CO$ has a much higher affinity (about $200-250$ times) for haemoglobin compared to oxygen $(O_2)$.When inhaled,$CO$ binds with haemoglobin to form carboxyhaemoglobin,which is a stable compound.This prevents oxygen from binding to haemoglobin,thereby significantly reducing the oxygen-carrying capacity of the blood.

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