Quit smoking

      The more a person smokes and the longer the habit lasts, the higher the risk of diseases. Smoking remains the main and primary modifiable risk factor that has the greatest impact on the development of non-communicable diseases (NCDs) and mortality rates worldwide. Unlike genetic or age factors, smoking is a behavioral habit that can be quit, making it particularly significant in prevention. According to modern research, tobacco smoking is directly related to an increased risk of developing ischemic heart disease (IHD), stroke, oncological diseases (especially lung cancer), chronic obstructive pulmonary disease (COPD), and diabetes.

      The cardiovascular system suffers particularly severely. Nicotine causes regular increases in heart rate (tachycardia), raises blood pressure, and contributes to the narrowing of blood vessels. This creates a constant load on the heart and significantly increases the risk of ischemic heart disease, myocardial infarction, and stroke, even in relatively young people. Smokers have a 1.5 to 4 times higher risk of the first manifestation of IHD compared to non-smokers, and the frequency of myocardial infarctions is three times higher. The mortality rate from cardiovascular diseases among active smokers (20 or more cigarettes a day) exceeds that of non-smokers by 2.5 times.

      Nicotine directly affects the central nervous system. It disrupts blood supply to the brain, leading to impaired memory, decreased attention span, and cognitive functions. Prolonged exposure to toxins can cause fine motor skill impairments and coordination issues—making it harder for a person to perform precise actions, such as writing by hand or tying shoelaces.

      The link between smoking and oncology is particularly concerning: the incidence of lung cancer among heavy smokers is 20 to 30 times higher than among those who have never smoked. According to WHO data, tobacco accounts for about 22% of all cancer deaths worldwide. Many substances, including benzene, formaldehyde, and polonium-210, provoke cell mutations, significantly increasing the risk of developing cancer not only of the lungs but also of the larynx, esophagus, pancreas, bladder, and other organs.

      Tobacco smoking also significantly contributes to the development of respiratory diseases. It is the primary cause of chronic bronchitis, emphysema, and asthma, reducing lung function even in the early stages of use. Even young people who have recently started smoking show disruptions in respiratory system function.

      One of the first signs of respiratory system damage is difficulty breathing, accompanied by a persistent cough and shortness of breath even with minor physical exertion. This is because smoke and chemicals damage the lung alveoli, reduce lung elasticity, and cause bronchial inflammation. Over time, this can develop into chronic obstructive pulmonary disease (COPD)—an irreversible condition requiring constant medical supervision.

      Equally important is its impact on reproductive health. In men, nicotine reduces sperm motility and can lead to erectile dysfunction. In women, it disrupts hormonal balance, worsens egg quality, and increases the risk of miscarriages, premature births, and congenital pathologies in children. Even passive smoking during pregnancy poses serious risks to fetal development.

      Nicotine users often report low physical endurance—quick fatigue, weakness, and a feeling of being "run down." This is a consequence of tissue oxygen deprivation and chronic nervous exhaustion. The nervous system, constantly under stress due to fluctuations in dopamine and adrenaline levels, loses its ability to recover.

      Importantly, the impact of smoking on health is dose-dependent: the more a person smokes and the longer the habit lasts, the higher the risk of diseases. However, quitting smoking significantly reduces these risks within just a few years. For example, five years after quitting, the risk of heart attack is halved, and after 10 to 15 years, it approaches the level of non-smokers.

      From a public health perspective, reducing the prevalence of smoking is one of the most effective ways to reduce the burden of NCDs. Research shows that 3 to 11% of cases of non-communicable diseases could be prevented by quitting tobacco.