Nicotine and Cortisol: Why Smoking Feels Like Stress Relief

Quick answer: Nicotine raises cortisol, yet most smokers describe cigarettes as stress relief. The usual explanation is the withdrawal cycle: between cigarettes, falling nicotine brings on tension, and the next cigarette relieves it. When people quit, cortisol drops within a day, and over the following months their stress and anxiety fall below the levels of people who keep smoking.

The stress-relief narrative around smoking is one of the strongest psychological barriers to quitting. "I smoke to relax" is genuinely felt — and it's not entirely wrong. It's just incomplete in a way that keeps people trapped.

What Cortisol Is and What It Does

Cortisol is the primary glucocorticoid stress hormone, produced by the adrenal glands under control of the hypothalamic-pituitary-adrenal (HPA) axis. It has broad effects across the body:

• Metabolic: Raises blood glucose, mobilizes fat stores
• Immune: Has anti-inflammatory effects at high doses; can suppress immune function chronically
• Cardiovascular: Raises blood pressure, increases heart rate
• Cognitive: In acute doses, enhances alertness and consolidates memories; chronically elevated, impairs hippocampal function and memory

Cortisol is not inherently bad — it's the body's emergency fuel system. The problem is chronic elevation, which contributes to anxiety, depression, weight gain (especially abdominal), immune suppression, and cardiovascular disease.

What Nicotine Does to Cortisol

Nicotine directly stimulates the HPA axis. Specifically:

• Nicotine activates nAChRs in the hypothalamus, triggering CRH (corticotropin-releasing hormone) release
• CRH stimulates the pituitary to release ACTH (adrenocorticotropic hormone)
• ACTH stimulates the adrenal cortex to produce cortisol

Additionally, nicotine stimulates the adrenal medulla (via the autonomic nervous system) to release epinephrine (adrenaline) — another stress hormone that amplifies the cortisol response.

A leading pharmacology review describes nicotine as a drug that releases catecholamines such as adrenaline, and cigarette smoking is associated with raised cortisol in the short term. How big the rise is varies with the dose and the person, so we don't give a single percentage.

The Paradox: Why Smokers Feel Relaxed

If cigarettes raise cortisol, why do smokers feel calmer after smoking?

The usual explanation is the withdrawal cycle. Nicotine's half-life averages about two hours, so between cigarettes levels fall and mild withdrawal sets in: restlessness, irritability, tension, trouble concentrating. The next cigarette relieves that. The relief is real, but much of what it relieves is the withdrawal that built up since the last one.

Two studies of people quitting back this up. In one, smokers who stayed quit reported steadily less stress over six months, while those who went back to smoking stayed stressed. In another, of 491 smokers at NHS clinics, those who stayed quit had a clear fall in anxiety six months later, and those who relapsed had a small rise.

Chronic Effects on the HPA Axis

In a study of 196 middle-aged adults, smokers had higher cortisol levels through the day, on work days and weekends, and a larger cortisol rise after waking. The authors attribute this mainly to nicotine. Comparisons between smokers and non-smokers across studies have been inconsistent, though.

What Happens After Quitting

This is often told backwards. Cortisol does not surge when you stop — it drops.

• In 112 smokers quitting with a 15 mg nicotine patch, cortisol fell significantly after one day without smoking and stayed lower at 1, 2 and 6 weeks. The drop was bigger in heavier smokers.
• People with the lowest cortisol on their first smoke-free day reported more urges, withdrawal symptoms and stress, and a steep drop tended to go with relapse.
• Other studies found the same pattern: a steep fall in cortisol and a weaker stress response early in a quit predicted a quicker relapse, especially in men.

So the stress of the first weeks is real, but it seems to come from withdrawal and from a stress system adjusting to life without nicotine, not from a cortisol spike. Over the following months, people who stay quit report less stress and anxiety than people who keep smoking.

Cortisol and Weight

Long-term high cortisol is linked with fat around the middle, and cortisol falls after quitting. Whether that changes where former smokers carry fat has not been shown directly. The weight many people gain after quitting — 4–5 kg on average after a year, with wide variation — comes mainly from appetite returning and nicotine's effect on metabolism ending.

Practical Implications for Quitting

• Stressful moments bring cravings. Part of that is learned — cigarettes and stress have gone together for years — and part is withdrawal. Either way, the urge passes; the NHS says cravings usually last a few minutes.
• Plan for stress in the first weeks. Early abstinence can make stressful tasks feel harder: in one lab study, 18 hours without smoking raised blood-pressure responses to stress and worsened performance. Have a plan — a walk, slow breathing, calling someone — for the hard moments.
• Movement helps. A single bout of exercise reduces cravings and withdrawal symptoms, including tension, for up to 50 minutes.
• It gets easier. The NHS says withdrawal symptoms last three to four weeks on average. See the withdrawal timeline for more.

References

1. Steptoe A, Ussher M. "Smoking, cortisol and nicotine." Int J Psychophysiol, 2006. PubMed
2. Ussher M, West R, Evans P, et al. "Reduction in cortisol after smoking cessation among users of nicotine patches." Psychosom Med, 2006. PubMed
3. al'Absi M. "Hypothalamic-pituitary-adrenocortical responses to psychological stress and risk for smoking relapse." Int J Psychophysiol, 2006. PubMed
4. al'Absi M, Amunrud T, Wittmers LE. "Psychophysiological effects of nicotine abstinence and behavioral challenges in habitual smokers." Pharmacol Biochem Behav, 2002. PubMed
5. Cohen S, Lichtenstein E. "Perceived stress, quitting smoking, and smoking relapse." Health Psychol, 1990. PubMed
6. McDermott MS et al. "Change in anxiety following successful and unsuccessful attempts at smoking cessation." Br J Psychiatry, 2013. PubMed

Frequently Asked Questions

Does smoking actually reduce stress?

It relieves the tension of nicotine withdrawal, which is why it feels calming. Studies of people who quit find their stress and anxiety fall over the following months, while people who keep smoking stay about as stressed as before.

Why does quitting feel so stressful?

Withdrawal brings irritability, anxiety and restlessness, usually worst in the first week. Cortisol actually drops when you stop, and people whose cortisol drops most tend to find the early days hardest. The NHS says withdrawal symptoms last three to four weeks on average.

Does nicotine help with anxiety?

In dependent smokers it relieves withdrawal anxiety for a while. Over months, people who quit report less anxiety than those who keep smoking. If you have an anxiety disorder or take medication for your mental health, talk to your doctor before quitting — stopping smoking can change the blood levels of some medicines, such as clozapine and olanzapine.

Can exercise replace the stress-relief role of smoking?

It can help. A single bout of exercise reduces cravings and withdrawal symptoms, including tension, for up to 50 minutes. Exercise programmes have not been shown to raise quit rates on their own, so use it alongside stop-smoking support rather than instead of it.

What to Read Next

• Dopamine and Nicotine Addiction: Why Quitting Is Hard
• Nicotine Withdrawal Brain Chemistry: What's Actually Happening
• Energy Levels After Quitting Smoking: What to Expect