Health effects of cigarette smoking
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Increased Morbidity and Mortality from Cigarette Smoking
Cigarette smoking is a leading cause of preventable illness and death worldwide. It is strongly linked to increased overall morbidity and mortality, contributing to a wide range of diseases and health complications Sherman2006Cb1991Fielding1985+1 MORE.
Cancer Risks Associated with Cigarette Smoking
Smoking is a major cause of several types of cancer, including lung, oral cavity, larynx, bladder, and renal pelvis cancers. It also contributes to the development of cancers in the pancreas, stomach, cervix, liver, penis, and rectum Sherman2006Cb1991Dai2022+1 MORE. The chemicals in cigarette smoke, such as nicotine, acrolein, aromatic hydrocarbons, and heavy metals, play a key role in causing inflammation and DNA damage, which can lead to cancer .
Cardiovascular Disease and Atherosclerosis
Cigarette smoking is a significant risk factor for cardiovascular diseases, including coronary artery disease, cerebrovascular disease, and atherosclerotic peripheral vascular disease Sherman2006Cb1991Fielding1985+5 MORE. Smoking causes endothelial dysfunction, chronic inflammation, and increased blood clotting, all of which contribute to the development and progression of atherosclerosis and other heart-related conditions Yanbaeva2007Ishida2024Hahad2023. It also leads to changes in blood parameters, such as increased white and red blood cell counts, which are associated with a higher risk of cardiovascular problems .
Respiratory Diseases and Chronic Obstructive Pulmonary Disease (COPD)
Smoking is the single most important risk factor for chronic obstructive pulmonary disease (COPD). It is associated with lower lung function, increased respiratory symptoms, and a higher risk of respiratory infections Sherman2006Cb1991Yanbaeva2007. Exposure to cigarette smoke, even secondhand, increases the risk of lung cancer and respiratory illnesses in both adults and children Sherman2006Cb1991.
Systemic Inflammation and Immune Dysregulation
Cigarette smoking triggers a low-grade systemic inflammatory response, as shown by elevated levels of C-reactive protein, fibrinogen, and other inflammatory markers Yanbaeva2007Ishida2024Liu2023+1 MORE. It also disrupts immune system function, affecting immune cells like macrophages, neutrophils, and T lymphocytes, which can promote inflammation and cancer development .
Effects on Pregnancy and Child Health
Women who smoke during pregnancy face a higher risk of complications, especially intrauterine growth retardation. Children exposed to secondhand smoke have more frequent lower respiratory tract illnesses and reduced lung growth Sherman2006Cb1991.
Other Health Effects: Peptic Ulcer Disease and Blood Changes
Smokers are more likely to develop peptic ulcer disease compared to non-smokers Sherman2006Cb1991. Smoking also causes significant changes in blood parameters, such as increased hemoglobin, hematocrit, and mean corpuscular volume, which may contribute to diseases like atherosclerosis and polycythemia vera .
Dose-Response Relationship and Smoking Reduction
There is a clear dose-response relationship between smoking and many health outcomes, with higher levels of smoking leading to greater health risks . Reducing the number of cigarettes smoked can lower the risk of lung cancer and, to some extent, cardiovascular disease, but the risk remains high compared to non-smokers. Complete cessation is the most effective way to reduce health risks .
Conclusion
Cigarette smoking has widespread and serious health effects, including increased risks of cancer, cardiovascular and respiratory diseases, systemic inflammation, immune dysfunction, pregnancy complications, and blood abnormalities. While reducing smoking can lower some risks, quitting entirely is the best way to protect health and prevent disease Sherman2006Cb1991Fielding1985+7 MORE.
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Most relevant research papers on this topic
Health effects of cigarette smoking.
Cigarette smoking increases overall morbidity and mortality, is a cause of cancer in various organs, and contributes to various diseases, including chronic obstructive pulmonary disease, heart disease, and stroke.
Systemic effects of smoking.
Chronic cigarette smoking leads to systemic oxidants-antioxidants imbalance, low-grade systemic inflammation, and altered rheologic, coagulation, and endothelial function markers, with some effects persisting up to 20 years after quitting.
Cigarette Smoking and Atherosclerotic Cardiovascular Disease
Cigarette smoking contributes to atherosclerosis and thrombosis by causing endothelial dysfunction, inflammation, and thrombosis, emphasizing the need for smoking cessation to protect cardiovascular health.
Dysregulation of immunity by cigarette smoking promotes inflammation and cancer: A review.
Cigarette smoking promotes inflammation and cancer by affecting immune cells and influencing molecular mechanisms, including epigenetics and DNA damage.
Cigarette Smoking Reduction and Health Risks: A Systematic Review and Meta-Analysis.
Substantial smoking reduction may decrease lung cancer risk, but its impact on cardiovascular disease risk and other health endpoints remains unclear.
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