1. Health
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

Is Dizziness Normal After Quitting Smoking?


Updated June 12, 2014

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Is Dizziness Normal After Quitting Smoking?
Maria Pereira Photography/Moment Open/Getty Images

Question: Is dizziness normal after quitting smoking?

When I quit smoking, I started feeling slightly dizzy within hours. It's not bad enough that I'll faint, but it's a little scary. I think it might be related to smoking cessation because it started after I quit. Someone told me it's because more oxygen is reaching my brain now that I'm not smoking anymore. Is that true?

Answer: There are a few things that may contribute to dizzy, shaky feelings when we first stop smoking.

Nicotine is a stimulant, meaning it revs some of the body's functions up into a higher gear. When we smoke, nicotine is absorbed through the lining of the lungs into the bloodstream, reaching the brain within 7 to 10 seconds. Once there, it causes a chemical reaction that releases adrenaline, the "fight or flight" hormone. Adrenaline speeds the heart up, constricts blood vessels and raises blood pressure.

Additionally, carbon monoxide from cigarette smoke reduces the amount of oxygen in the blood and both factors work to diminish blood flow (and oxygen) to the brain.

When we stop smoking, nicotine is no longer triggering adrenaline to constrict blood flow and the absence of inhaled carbon monoxide means there is more oxygen in the blood. You may have read or heard that this causes dizziness for the newly quit ex-smoker, however, there have been no conclusive studies that show this to be the case.

Quit Aid Side Effects

Some quit aids may cause dizziness for users:

  • The nicotine patch. A form of nicotine replacement therapy that looks like a tan or clear bandage, the patch is the only NRT that lists dizziness as a common side effect. However, all NRTs contain nicotine, and a nicotine overdose can cause dizziness. If you use NRTs to quit smoking, it is important that you follow the manufacturer's directions for use carefully and wean off of them in the time suggested.
  • Bupropion. Commonly known as Zyban and produced by GlaxoSmithKline, this non-nicotine quit aid was originally marketed and prescribed under the name of Wellbutrin as an anti-depressant.
  • Varenicline Tartrate. Developed by Pfizer, Inc. and marketed under the name of Chantix in the U.S., this is another non-nicotine quit aid.

If you become dizzy, use care when getting up from a lying or sitting position. Rather than jumping up, sit and stand up slowly to let your body adjust to the change of blood pressure.

If you experience prolonged or severe dizziness while using any of the above quit aids, consult your doctor.

Nicotine and Blood Sugar

In addition to the stimulant effects of nicotine mentioned above, nicotine also inhibits the release of insulin from the pancreas. Insulin is a hormone that removes excess sugar from the blood. It is instrumental in helping the body keep blood sugar in balance.

This imbalance leaves smokers slightly hyperglycemic, with more sugar in their blood than they should have.

Hunger is a symptom of nicotine withdrawal and of hypoglycemia (low blood sugar). Research has not shown a correlation between nicotine and low blood sugar when quitting tobacco, but moderate hypoglycemia can produce feelings of dizziness.

To minimize the risk of low blood sugar, eat regular meals and don't let yourself get too hungry. If you do find you're feeling shaky or lightheaded from hunger, eat a piece of fruit or drink a small glass of fruit juice to quickly raise blood sugar. Try to avoid eating processed sugar as much as possible because sugary treats can trigger smoking urges and pack on those unwanted pounds we all fear when we stop smoking.


Smoking cessation is stressful for most of us early on. We've come to think of our cigarettes as companions, albeit destructive, life-stealing companions. When we stop smoking, the stress of that change can create feelings of anxiety initially. If you experience cessation-related anxiety when you stop smoking, try using deep breathing or meditation to calm your mind and body.


It is also worth noting that a lot of us tend to not drink enough water, and suffer from dehydration to some extent. Dehydration can cause us to feel lightheaded, so make sure you're getting enough fluids on a daily basis.

Drinking a tall glass of water is a great craving-buster and good hydration helps us feel better overall, a win/win.

Knowledge is Power

Nicotine withdrawal, while intense, is a temporary phase of smoking cessation. Better days are ahead once we clear the toxins out and our bodies go back to functioning as they're meant to.


National Institute on Drug Abuse. Cigarettes and Other Tobacco Products. http://www.nida.nih.gov/Infofacts/Tobacco.html. Accessed September, 2011.

Pfizer, Inc. Chantix Medication Guide. http://labeling.pfizer.com/ShowLabeling.aspx?id=554. Accessed September, 2011.

National Cancer Institute. Harms of Smoking and Health Benefits of Quitting. http://www.cancer.gov/cancertopics/factsheet/Tobacco/cessation. Accessed September, 2011.

National Institutes of Health. Water in Diet. http://www.nlm.nih.gov/medlineplus/ency/article/002471.htm. Accessed September, 2011.

  1. About.com
  2. Health
  3. Smoking Cessation
  4. After You Quit Smoking
  5. Nicotine Withdrawal
  6. Is Dizziness Normal After Quitting Smoking?

©2014 About.com. All rights reserved.

We comply with the HONcode standard
for trustworthy health
information: verify here.