The science behind: Why is smoking so addictive?
When nicotine goes into your brain it releases chemicals that relax you or make you more focused. Let’s explain how you get hooked onto these sensations.

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Additional info:
Why is smoking additive? http://bit.ly/1mEKeVj
Why is it so hard to quit?- American Heart Association: http://bit.ly/1fnzH27
How cigarettes damage your body: http://bit.ly/1pDcj42

chemicals in cigarettes

Source: Brain On Cigarettes? Not A Science Experiment- Why Teenagers Smoke