Cigarettes contain nicotine, which is highly addictive.
Nicotine alters the balance of two chemicals, called dopamine and noradrenaline, in your brain. 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 produces feelings of pleasure and reduces stress and anxiety. This is why many smokers enjoy the nicotine rush and become dependent on it.
Most people start smoking when they are in their teens and are addicted by the time they reach adulthood.
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