A - Smoking is associated with increased inci | vedclass

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(A) is true: Smoking is a well-established cause of lung cancer due to the presence of carcinogens in tobacco smoke.$R$ is true: Smoking increases the

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$A$ and $R$ are both true.

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(A) is true: Smoking is a well-established cause of lung cancer due to the presence of carcinogens in tobacco smoke.$R$ is true: Smoking increases the level of carbon monoxide $(CO)$ in the blood. $CO$ binds to haemoglobin with a much higher affinity than oxygen,forming carboxyhaemoglobin,which significantly reduces the oxygen-carrying capacity of the blood.Both statements are correct,and $R$ explains the physiological impact of smoking on blood chemistry,although it is not the direct mechanism for cancer induction.

$A$ - Smoking is associated with increased incidence of cancer of lung.
$R$ - It increases $CO$ content in blood and reduces the concentration of haem-bound oxygen.

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$A$ - Smoking is associated with increased incidence of cancer of lung.$R$ - It increases $CO$ content in blood and reduces the concentration of haem-bound oxygen.