smokers ....IMP what makes a person addicted to smoking

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i read an article yesterday....cigaratte.contains a substance called niotrate[smething like that] i happens like this .this chemical never harms health of human being ..when this chemical enters our body..it sends a high pulses to brain.and our brain which is adjusted to low pulses when once it recives high signal....it become more active...so nxt time when widout that chemical substance it acts in a dull manner....so this makes a smoker addicted to smoking....... but the other chemicals that we inhale in the course of smoking [which will be present in minor samples] due to addiction spoil out health if u knw more plzzz share it wid me