It is estimated that smoking one cigarette pack enters the body 400 ml of carbon monoxide, whereby the cells are deprived of the desired amount of oxygen. Nicotine, getting into brain cells, initially improves its performance and results in arousal. But after some time, the process of the brain slows down because of the need of rest. When smoking a long time to enter the brain gets used to nicotine and some point begins to need it. If a person does not satisfy this need, it becomes irritable, restless, nervous.
Tobacco smoke directly affects the respiratory system. The mucous membrane of the mouth, pharynx and trachea takes the brunt receives irritation that can cause asthma. Chronic cough affects almost all smokers. Cancer lips, tongue, larynx, trachea may be a consequence of prolonged smoking. Because of this habit becomes vulnerable to the cardiovascular system. Diseases such as ischemia, angina pectoris, hypertension is often found in smokers. Nicotine and some components of tobacco contribute to gastric ulcer and duodenal ulcers, gastritis. Teeth and gums however suffer from cigarette smoke. The need for prosthetics often occurs in people smoking.
Defense mechanisms of the human body can withstand the pernicious influence of certain substances contained in tobacco smoke. But a considerable amount of harmful components that enter the body in the process of smoking, can cause irreparable damage to health.