Nicotine alters the balance of chemicals in your brain. It mainly affects chemicals called dopamine and noradrenaline. When nicotine changes the levels of these chemicals, your mood and concentration levels change. Many smokers find this enjoyable. The changes happen very quickly. When you inhale the nicotine, it immediately rushes to your brain where it takes effect. This is why many smokers enjoy the nicotine rush and become dependent on it. The more you smoke, the more your brain becomes used to the nicotine. This means that you have to smoke more to get the same effect.
once you break it down, most of the ingredients used in cigarettes are addictive, for example, the most common is nicotine, the ones you don't know about would be cyanide and arsenic, which, in small doses (.0001%) are highly addictive. there are over 4000 additives in cigs, to make them more addictive, but the addiction is utilized for population control. the truth commercials you see on tv are campaigned by phillip morris.
Cigarettes are legal, & we have every RIGHT to smoke them if we're of age. BEER and other forms of alcohol are addictive-why not ask about them too? Many prescription drugs are addictive. No one gets out of here alive anyhow, whether they smoke or not!