Red Indians first started tobacco smoking in America. Sources of Tobacco Tobacco, whether smoked or chewed, causes addiction due to the presence of Nicotine. Tobacco is the dried leaves of the plant Nicotiana tobacum and Nicotiana rustica. Nicotine is the substance that causes addiction to tobacco. Smoke also contains carbon-mono-Oxide, polycyclic hydrocarbon like N-nitroso-dimethylene,Tar etc. Effects of Tobacco The polycyclic hydrocarbons are carcinogenic. The smoking produces Emphysema and bronchitis. In Emphysema the respiratory surface in the lungs is reduced due to degeneration of separation of alveoli. The N-nitroso-dimethylene is a carcinogen and cause lung cancer. About 95% of lung cancer-patients are smokers. Out of 10% smoke inhaled, only 1% is finally absorbed, and the addiction, therefore, takes a long time. The teeth are stained and bad breath causes discomfort to the others. Mouth cancer is commonly found among tobacco chewers. Nicotine is a stimulant and makes the condition of nerve impulse faster. It also causes tachycardia(Heart beat¡) and increase the secretion of adrenaline. In pregnant cowmen nicotine causes retardation of the growth of the foetus.
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