Select the incorrect statement from the following.

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Nicotine stimulates adrenal gland to release adrenaline and nor-adrenaline which raise blood pressure and increase heart rate.

Smoking is associated with increased incidence of cancers of lung, urinary bladder, and throat.

Tobacco chewing is associated with increased risk of cancer of the oral cavity.

Smoking increases blood levels of carbon monoxide and oxyhaemoglobin.

answer is D.

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Detailed Solution

Smoking increases blood levels of carbon monoxide and decreases oxyhaemoglobin content. When CO binds to haemoglobin, it forms a highly stable compound called carboxyhaemoglobin. This reduces the amount of haemoglobin available to carry oxygen, leading to decreased oxygen delivery to the body’s tissues. The effects of CO poisoning can be severe and include headaches, nausea, loss of consciousness, and death in severe cases.

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