Tobacco is a plant grown for its leaves, which are smoked, chewed, or sniffed for a variety of effects. It is considered an addictive substance because it contains the chemical nicotine.In addition to nicotine, tobacco contains over 19 known cancer-causing chemicals (most are collectively known as "tar") and more than 4,000 other chemicals. These include acetone, ammonia, carbon monoxide, cyanide, methane, propane, and butane.Nicotine acts as both a stimulant and depressant on your body. It increases your bowel activity, saliva, and bronchial secretions. It stimulates the nervous system and may cause tremors in the inexperienced user, or even convulsions with high doses.On average, tobacco increases your heart rate 10 to 20 beats per minute, and it increases your blood pressure reading by 5 to 10 mmHg (because it constricts the blood vessels).Nicotine may also cause sweating, nausea, and diarrhea. Nicotine elevates the blood level of glucose (blood sugar) and increases insulin production. Nicotine also tends to enhance platelet aggregation, which may lead to blood clots.Finally, tobacco is highly addictive. It is considered mood and behavior altering. Tobacco is believed to have an addictive potential comparable to alcohol, cocaine, and morphine.
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Smoking is bad for human.Smoking is one of the most common forms of recreational drug use.Most drugs that are smoked are considered to be addictive. Some of the substances are classified as hard narcotics, like heroin and crack cocaine.smoking is among the leading causes of diseases such as lung cancer,heart attacks and chronic obstructive pulmonary disease.The effects of tobacco on health are significant, depending on the way the tobacco is used (smoked, snuffed or chewed) and the amount. Major health effects of smoking, the most common use of tobacco, include an increased risk in lung cancer and cardiovascular disease. Therefore is bad for us if we are one of the smoker in this world.For those who are now is a smoker,I hope he or she will stop smoking for entire life.
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