Addiction, or dependence, to nicotine occurs both physically and psychologically.

Most people develop very strong psychological associations with nicotine use, including repetitive and relaxing behaviors. Nicotine also causes strong physical cravings. It causes the brain to release a chemical called dopamine, which creates feelings of pleasure. Over time, the brain requires nicotine in order to produce these feelings.

Tobacco products are dangerous to a person's health and increase a person's chances of developing certain cancers and other health problems. These include lung cancer, heart disease, emphysema, stoke, bronchitis, high blood pressure, infertility, and coronary artery disease. Women who smoke while pregnant can damage their unborn child. Babies who are exposed to smoke have a much higher risk of dying from Sudden Infant Death Syndrome (SIDS). Everyone exposed to secondhand smoke is at a higher risk of related health complications.

People who are addicted to nicotine show a variety of symptoms when they do not use nicotine. This can include irritability, shakiness, trouble paying attention, trouble sleeping, increased appetite, and intense cravings. Anyone who uses nicotine is at risk for developing an addiction, although the younger a person starts, the greater the chances addiction will result.

Treatment for nicotine dependence is to quit using the substance. There are many tools available to help a person quit. These include nicotine patches and gums that allow a person to gradually reduce dependency and other nicotine substitutes. A healthcare provider can prescribe these aids and many are available over the counter. Because nicotine addiction is so strong, a person may experience cravings months or even years after quitting, so an ongoing plan for remaining nicotine-free can help reduce chances of relapse.