For most people, smoking is a habit that is almost impossible to break. Everywhere you look, there are many campaigns against the cessation of this very fatal addiction. Nicotine is a very addictive substance that is present in tobacco products that is why it is very difficult to stop smoking. This compound is used as a stimulant and, years ago, as an insecticide. It is sai that the addiction to nicotine is like addiction to cocaine or heroin.