The health effects of tobacco are the circumstances, mechanisms, and factors of tobacco consumption on human health. Epidemiological research have been focused primarily on tobacco smoking,[1] which has been studied more extensively than any other form of consumption.[2] Tobacco use leads most commonly to diseases affecting the heart and lungs, with smoking being a major risk factor for heart attacks, strokes, chronic obstructive pulmonary disease (COPD), emphysema, and cancer (particularly lung cancer, cancers of the larynx and mouth, and pancreatic cancer). It also causes peripheral vascular disease and hypertension, all developed due to the exposure time and the level of dosage of tobacco. Furthermore, the earlier and the higher level of tar content in the tobacco filled cigarettes causes the greater risk of these diseases. Due to higher levels of tar content in third world countries, people who smoke in third world countries are more vulnerable to diseases. Poorer nations also lack the inclusion of filters that richer nations have, however the mortality rate does not show a significant decrease due to filters as many people, filter or no filter, die due to the main reason being their addiction and intake of tobacco.[3]
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