These words are used on this website, and you may encounter them in a health care professional’s office or online, too.

Carbon monoxide – Carbon monoxide (CO) is a gas that has no odor or color. If you smoke, your cells will not get the amount of oxygen needed to work properly. This is because carbon monoxide keeps red blood cells from carrying a full load of oxygen.

Coronary heart disease – Coronary heart disease (CHD) is a narrowing of the small blood vessels that supply blood and oxygen to the heart. CHD is also called coronary artery disease. Smokers have a much higher risk of heart disease.

Nicotine – Nicotine is a bitter-tasting compound that naturally occurs in large amounts in the leaves of tobacco plants.

Nicotine replacement therapy (NRT) – The use of products that provide low doses of nicotine but do not contain the toxins found in smoke. The goal of NRT is to relieve cravings for nicotine and ease the symptoms when someone stops using cigarettes or smokeless tobacco.

Nicotine withdrawal – Nicotine withdrawal creates anxiety, irritability, headache, hunger, and a craving for cigarettes or other sources of nicotine. These symptoms occur when a nicotine-dependent person suddenly stops smoking or using tobacco, or cuts back on the number of cigarettes or amount of tobacco products used.

Placebo – A harmless substance used in experiments to test how well another substance, such as a drug, produces a certain effect.

Smoking cessation – The medical term for "quitting smoking."

Get answers to frequently asked questions about NICOTROL Inhaler and quitting smoking