Why is it Hard to Quit Smoking?

Smoking is one of the major causes of death in the modern world. Tobacco is responsible for the death of 1 in 10 adults all over the world, which translates to around 5 million deaths every year. Terrible statistics, isn't it? It is because of this fact that cigarette smoking is now a public health priority. Despite all the risks smoking raises the number of cigarette smokers all other the world has not dropped. But why is it hard to quit smoking?

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