Why can nicotine use create dependence?

Nicotine creates dependence primarily by acting on the brain's reward pathways and causing the body to adapt to its regular presence. When nicotine is consumed, it binds to nicotinic acetylcholine receptors in the nervous system, stimulating the release of neurotransmitters such as dopamine. This dopamine release reinforces repeated use by producing pleasurable, mood-altering effects.123

As exposure continues, the brain adapts by altering the number and sensitivity of these receptors, leading to tolerance—a state where progressively larger or more frequent doses are required to achieve the same effect. Eventually, the body develops physical dependence, meaning it requires the presence of nicotine to function normally.23

When nicotine intake is reduced or stopped, the user experiences withdrawal symptoms, such as irritability, anxiety, difficulty concentrating, and intense cravings. These symptoms often drive the user to continue consumption, creating a cycle of compulsive seeking and use that characterizes addiction.123