Addiction is one of the most common reasons why people smoke. One reason why smoking causes addiction is that the nicotine found in the substance makes the person want it more. It releases epinephrine, which stimulates the human body causing the blood and heart rate to increase. Nicotine then sets off a certain part of the brain that makes you feel very happy by releasing a hormone called dopamine. Once this wears off, the person would feel depressed wanting to experience the happy feeling again. This is how it transfigures into an addiction.
