Monday, June 18, 2012

Why Smoking Causes Cancer ?

                                          Tobacco smoke contain more than 60 carcinogenic compounds. 4000 individual substances identified in tobacco smoke, including carbon monoxide, hydrogen cyanide, ammonia and other toxic irritants. The main reason is tobacco contains nicotine. Nicotine is a additive content which alters brain functioning.

                                           Nicotine is naturally occurring liquid alkaloids. When a man smoke nicotine is absorbed through the skin and mucosal lining of the mouth and nose and by inhalation int he lungs. In the body it activate the same reward system as do other drugs such as cocaine. in the brain nicotine increases the level of neurotransmitter dopamine. so the brain responsible for feeling pleasure. People continue dosing themselves frequently throughout the day to maintain the pleasurable effects of nicotine and to prevent withdrawal symptoms.

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