Zoology - Human Health and Diseases Question with Solution | TestHub

Tobacco contains a large number of chemical substances including nicotine, an alkaloid. Nicotine stimulates the adrenal gland to release adrenaline and nor-adrenaline into blood circulation, both of which raise blood pressure and increase heart rate. Smoking is associated with an increased incidence of cancer of the lung, Urinary bladder and throat, bronchitis, emphysema, Coronary heart disease, gastric ulcer, etc. Tobacco chewing is associated with increased risk of cancer of the oral cavity. Smoking increases carbon monoxide (CO) content in blood and reduces the concentration of haemoglobin oxygen. This causes oxygen deficiency in the body or emphysema.