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Usually ,teenagers take up smoking in order to look cool and in order to experiment something new that is generally forbidden. They start smoking by imitation effect without measuring their act's conséquences. As a matter of fact, cigarette causes very quickly a strong addiction and becomes difficult to quit after a short while. In spite of the fact they are aware of that, they don't doubt they will be able to control the situation. In the mean time, the harm is being caused and they turn to be nicotin-addicted.