There are a lot of people who eat a lot of fruit, vegetables, do exercises every day, and who, nevertheless, are smokers. So, healthy lifestyle means nothing if the person smokes. The statement that smoking may be harmful for our health is rather old. That is why most people do not pay any attention to it. However, smoking represents a lot of health risks. Cigarettes contain great numbers of chemical compounds and toxic substances. The temperature at which the cigarette burns is very high. That is why the tobacco starts producing different toxins. The most harmful products are the following. The first health-killer is tar. It is carcinogen that causes cancer. Nicotine stimulates addiction and is able to increase the level of cholesterol in the organism. As for carbon monoxide, it tends too reduce ammount of oxygen in the human body. All the harmful substances that smoking produces reduce blood supply to the cells of organism. There are a number of factors that determine the extent of the damage caused by smoking. First of all it is the number of cigarettes the person smokes. The second factor is the presence of filter. And at last the way the tobacco has been prepared. Cardiovascular disease is one of the most frequent conditions caused by smoking. That is why it is possible to say that smoking and blood vessels can`t be called the best friends. Doctors say that cardiovascular disease is the main reason of death caused by smoking. The interaction of smoking and blood vessels does not do any good to the person. Cholesterol and other fats stay in the arteries and make them blocked, narrow and rigid. This process of arteries hardening develops over a number of years. The process of arteries narrowing called atherosclerosis presupposes the formation of blood clots. The process of interaction between smoking and blood vessels causes narrowing and hardening processes in the arteries. These harmful processes start earlier with the smokers and the clots are more numerous in numbers than with non-smokers. The interaction of smoking and blood vessels can result in different diseases. It depends on the kind of blood vessels involved in the process. It is a proved fact that cardiovascular disease is more common with those who smoke. Smokers are more subject to get cancer than non-smokers. The most frequent are throat cancer, lung cancer and mouth cancer which are very rare for non-smoking people. The more cigarettes a day you smoke, the longer period of your smoking, the deeper you inhale, the earlier in life you started smoking, the higher the risk of getting cancer. The risk of lung cancer drops to the level of non-smoking people only 15 years after the person gave up smoking. The person who smokes runs a risk of getting mouth cancer four times higher than a non-smoker. Cancer can develop in any area of the mouth. The most common places for the appearance of the cancer are on the lips and underneath the tongue. Among the most common types of cancer with smokers are also cervical cancer, bladder cancer, cancer of the pancreas, cancer of the oesophagus and cancer of kidneys.