Smoking, inhalation and exhalation of gases generated by the burning of any substance. This term usually describes the consumption of various tobacco products such as cigarettes, cigars, and pipe tobacco, which will address this value, but sometimes the source of the smoke is the burning of other plant matter such as the marijuana plant. Smoking is harmful to human health and can cause a wide range of chronic and fatal diseases. Cigarette Smoke Cigarette smoke is a highly complex mixture containing over 2000, and may have nearly 4,000 different gas and particulate elements. For example, the level of nicotine in tobacco is determined by the concentration of nitrates in the fertilizers supplied to the plant. Epidemiological heart disease Many epidemiological studies have reiterated the close connection between smoking and morbidity and mortality from heart disease Infertility. Smoking and smoking contribute about 30% of cancer deaths (see Table 1). Smokers die twice as much of cancer as non-smokers, and in heavy smokers the death is 3 to 4 times higher. Lung Disease The association between chronic obstructive pulmonary disease and smoking has been shown in many studies summarized in the US government's chief psychiatrist's report of 1984. For example, mortality from bronchitis And emphysema among heavy smokers is 40 times higher than among nonsmokers. Smoking appears to cause inflating by increasing the activity of proteolytic enzymes, which break down the healthy elastic tissue on the one hand and inhibit endogenous anti-proteolytic activity (mainly of antitrypsine alpha) on the other. This "passive smoking" is defined as exposing the non-smoker to the products of tobacco burning in a closed environment Tobacco smoke consists of two components - the one breathed by the smoker and the one that rises from the burning end of the cigarette. The final component accounts for about 85% of cigarette smoke in a closed room, and contains a higher concentration of hazardous ingredients than the inhaled smoke. In 1985, a typical injury to the facial skin, known as the "facial skin", was reported as a " "Smoking and gastrointestinal ulcers: The duodenal ulcer is twice as common in smokers as men, and 1.6 times higher in nonsmokers compared to nonsmokers.