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Effect of Smoking on Breathing, Gas Exchange & Pregnancy

Tar

Tar is a sticky brown substance produced by cigarettes that can stain a smoker’s fingers and teeth yellow/brown. It is also sometimes known as total particulate matter and is inhaled when a cigarette is smoked. Some of the chemicals in tar include benzene and benzo(a)pyrene.

Tobacco Smoke

Tobacco smoke contains many harmful gases that can be damaging to the body such as carbon monoxide, formaldehyde, hydrogen cyanide, ammonia and acrolein.

Passive Smoking

Passive smoking is involuntary smoking by non-smokers inhaling the smoke of others.

Smoke emitted from a lighted cigarette can be split into two types; mainstream smoke and sidestream smoke. Mainstream smoke is the smoke that the smoker inhales through the cigarette and sidestream smoke is the smoke that comes from the lit end of the cigarette. Up to 85% of smoke in a room where a cigarette has been smoked is sidestream smoke and this is the smoke that is inhaled by non-smokers. Often passive smoking can be more harmful that actual smoking because sidestream smoke is unfiltered and still contains many harmful smoke particles that mainstream smoke does not have due to the filter that most cigarettes have attached to them.

Carbon Monoxide

One of the main functions of the respiratory system is to provide the body with oxygen so that it can be delivered to vital cells that require oxygen to function. Oxygen is carried in red blood cells by reaction with a substance called haemoglobin to form oxyhaemoglobin. However, haemoglobin has a high affinity for carbon monoxide and if it is present it will react with the carbon monoxide instead of oxygen to form carboxyhaemoglobin. This occurs during smoking as cigarette smoke contains carbon monoxide, this means that the cells in the body of a smoker will not receive as much oxygen as those of a non-smoker and they may become short of breath as their lungs are forced to work harder to compensate for this. Once the haemoglobin in a red blood cell has reacted with carbon monoxide it will never be able to react with oxygen and so it is of no use for its intended purpose. This means that a smoker will have fewer red blood cells that are able to carry oxygen than a non-smoker.

Disease

a) Chronic Bronchitis

Smoking is the most common cause of chronic bronchitis. It stimulates the production of mucus in the lining of the bronchi and thickens the bronchi’s walls and those of the bronchioles resulting in the narrowing of these air passages. This means that less air is able to reach the lungs and heavy mucus or phlegm is coughed up. These passages then become more susceptible to infections, causing further damage.

b) Emphysema

Emphysema is also largely caused by smoking and is often accompanied by bronchitis. It is a disease in which the alveoli become damaged. Often this is because of the harmful chemicals present in cigarette smoke that pass through the walls of the alveoli when it is inhaled. The alveoli over-inflate and eventually burst and blend to form fewer larger air sacs, reducing the surface area over which gas exchange can take place. This significantly impairs oxygen and carbon dioxide exchange and the sufferer will have to breathe faster and heavier to compensate for this. Over the years the lungs also become less elastic as the tissue is destroyed due to chemical imbalance and this reduces their efficiency.

c) Chronic Obstructive Pulmonary disease

This is a term given collectively to many diseases of the lung including chronic bronchitis and emphysema.

d) Lung Cancer

Lung cancer is often caused when the harmful chemicals in cigarette smoke cause cells in the lung to mutate. These cells then multiply and spread, often forming a tumour, which can grow big enough to block the respiratory tubes and therefore prevent oxygen from reaching the lungs.

Human Fertility

Smoking has been proved to significantly affect fertility in both women and men. Studies have shown that women who smoke are likely to take longer to conceive than women who don’t. In men, smoking can impair sperm production and sometimes this will reduce the chances of a couple having a boy, as the y-chromosomes in the sperm are more vulnerable to the toxins of cigarette smoke.

Affects on the Foetus

When a woman is pregnant, she provides for the baby through her own body and what she takes into her body will also reach the baby. This means that when a pregnant woman smokes, many of the toxins that are affecting her body are also affecting the foetus. Like the mother, the foetus will have decreased oxygen levels and increased nicotine and carbon monoxide levels, which will get into the placenta and prevent the foetus from receiving the vital food and oxygen needed for it to grow. For this reason, babies born to mothers who are smokers are often underweight, resulting in many health problems. Women who smoke are also more likely to miscarry

A Child Whose Mother Smoked During Pregnancy

Children whose mothers smoked during pregnancy are more likely to suffer respiratory illnesses including asthma. Smoking during pregnancy has also shown to affect the child’s growth and intellectual ability; it will sometimes even affect the child’s reproductive organs and cause them fertility problems in later life.

Date: Oct 11,2021