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What Is Nicotine?

Nicotine is a naturally occurring substance found in tobacco plants and is responsible for much of tobacco's addictive potential. It stimulates receptors in the nervous system and can produce physical dependence. Nicotine is also the active ingredient in approved smoking cessation medications, including patches, gum, lozenges, and certain prescription products. Medical nicotine replacement therapy delivers controlled amounts of nicotine without exposing users to the combustion products in cigarette smoke.

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What Is Nicotine?

Nicotine is a naturally occurring substance found in tobacco plants and is responsible for much of tobacco's addictive potential. It stimulates receptors in the nervous system and can produce physical dependence. Nicotine is also the active ingredient in approved smoking cessation medications, including patches, gum, lozenges, and certain prescription products. Medical nicotine replacement therapy delivers controlled amounts of nicotine without exposing users to the combustion products in cigarette smoke.

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How Does Nicotine Affect the Body?

Nicotine binds to nicotinic acetylcholine receptors in the brain and nervous system. This stimulates the release of neurotransmitters, including dopamine, which contributes to its rewarding and dependence-producing effects. Nicotine can temporarily increase heart rate and blood pressure. Repeated exposure changes how the brain responds to nicotine, contributing to cravings and withdrawal symptoms when use stops. Its effects depend on the dose and method of exposure.

How Is Nicotine Used in Smoking Cessation?

Nicotine replacement therapy helps people stop smoking by reducing cravings and withdrawal symptoms. FDA-approved options include over-the-counter patches, gum, and lozenges, as well as prescription nicotine inhaler and nasal spray products. These medications deliver nicotine without the harmful combustion products found in cigarette smoke. Nicotine replacement therapy is intended to support smoking cessation, particularly when combined with behavioral counseling and an individualized quitting plan.

How Should Nicotine Replacement Products Be Used?

Nicotine replacement therapy instructions vary by product. Patches deliver nicotine through the skin over several hours, while gum and lozenges release nicotine through the lining of the mouth. Patch strengths commonly include 21 mg, 14 mg, and 7 mg, with a gradual reduction schedule based on smoking history and the specific product label. Gum and lozenges have different dosing and administration instructions. Follow the package directions or a healthcare professional's treatment plan.

What Are the Side Effects and Risks of Nicotine?

Nicotine can cause nausea, dizziness, headache, increased heart rate, and temporary blood pressure changes. Replacement products also have formulation-specific effects, such as skin irritation from patches or mouth discomfort from gum and lozenges. Excessive nicotine exposure can cause poisoning, especially in children. Nicotine is addictive, and continued exposure is not harmless. Pregnant or breastfeeding patients and people with certain cardiovascular conditions should seek medical guidance before using nicotine replacement products.

Common Questions About Nicotine

Is nicotine the substance that makes cigarettes addictive?

Yes. Nicotine activates reward pathways in the brain and contributes substantially to tobacco dependence and withdrawal symptoms.

Is nicotine replacement therapy safer than smoking?

Yes. FDA-approved nicotine replacement products avoid the toxic combustion products found in cigarette smoke and are effective smoking cessation aids when used correctly.

Can nicotine patches help someone quit smoking?

Yes. Nicotine patches deliver controlled amounts of nicotine to reduce cravings and withdrawal symptoms while a person stops smoking.

Can nicotine cause poisoning?

Yes. Excessive nicotine exposure can cause nausea, vomiting, dizziness, abnormal heart rate, and serious poisoning. Nicotine products must be kept away from children and pets.

References

DailyMed - NICOTINE TRANSDERMAL SYSTEM extended-release patches. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=dbbed17b-8ad3-05fb-fb63-03fbb75eae05. Date Accessed October 19, 2026.

Nicotine. LiverTox. https://www.ncbi.nlm.nih.gov/books/NBK548698/. Date Accessed October 19, 2026.

Nicotine. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/nicotine. Date Accessed October 19, 2026.

Nicotine Gum. MedlinePlus. https://medlineplus.gov/druginfo/meds/a684056.html. Date Accessed October 19, 2026.

Nicotine Transdermal Patch. MedlinePlus. https://medlineplus.gov/druginfo/meds/a601084.html. Date Accessed October 19, 2026.