Is nicotine addictive physically or psychologically?

Nicotine is primarily considered to be physically addictive due to its ability to stimulate the release of neurotransmitters like dopamine in the brain, creating pleasurable sensations that reinforce the desire to continue using it. This physical dependence can lead to withdrawal symptoms when use is discontinued. However, there is also a psychological component, as users often develop habits and routines around nicotine consumption, making quitting more challenging. Thus, both physical and psychological factors contribute to nicotine addiction.