Cigarette smoking damages lungs and heart. Cigarette smoking is harmful to a person’s lungs. Everyone who smokes does some damages to their lungs. Heavy smoking can also damage the heart and blood vessel.
Even people who do not smoke may be harmed by other people’s cigarette. If baby’s parents each smoke 20 cigarette a day, the child will indirectly smoked 80 cigarettes by time it is one year old. Non-smokers are likely to get cough and bronchitis if they spend much time in room with people who are smoking. In many place, cigarette smoking is no longer seen as socially acceptable.
Cigarette smoke contains three main ingredients. These are nicotine, tar, and carbon monoxide. Each of these has it own effect.
Nnicotine is addictive. Nicotine affects the brain. It stimulant, which means that it makes you feel more alert and active. It makes heart rate and blood pressure increase. People who smoke are more likely to suffer from heart disease than people who do not.
Nicotine is very poisonous substance. It used in some insecticides. A smoker takes about 2 mg of nicotine for each cigarette that it smokes. The nicotine is absorbed into the blood. But fifteen minutes after smoking the cigarette, half of this nicotine has been breakdown, so it just 1 mg remain in the blood.
Nicotine is addictive. This mean that once your body has got used to it, it is very hard to do without it. This is why many smokers find it difficult to give up smoking.
Tar can increase the chance of getting ling cancer. The tar in cigarette smoke is absorbed by some of the cells in the lungs, especially the ones lining the bronchi and bronchioles. Normally, these cells form a thin, protective layer. But the tar makes them divide, and build up into a thick layer. Some of these group of dividing sells may go on and on dividing, developing in to cancer.
Non-smokers do occasionally get lung cancer, but this is very rare. Most death from lung cancers are of people who smoked and all forms of cancer are more common in smokers than non-smokers.
Tar is an irritant. It makes the lining of the respiratory passage inflamed, causing chronic bronchitis. It also damages the cilia lining these passage, and cause extra mucus to be made by goblet cells. This mucus trickles down into the lungs – the cilia are no longer able to beat and sweep it upwards.
Bacteria breed in the mucus, causing infections. The person coughs, to try to move the mucus upwards. The constant coughing can damaged the delicate alveoli in the lungs. This makes it much more difficult for the person to get enough oxygen into their blood. They have emphysema.