Depression and smoking have a deeply intertwined relationship. Smokers are roughly twice as likely to have depression as non-smokers — and people with depression smoke at roughly twice the rate of the general population. Understanding this relationship is essential for anyone trying to quit smoking while managing depression.
Does Smoking Cause Depression — or Does Depression Cause Smoking?
Both directions exist. Longitudinal studies show that smoking increases the risk of developing depression — likely through its effects on dopamine, serotonin, and inflammatory pathways. Conversely, people with depression are significantly more likely to start smoking, often as a form of self-medication. The relationship is bidirectional and self-reinforcing: depression drives smoking, and smoking worsens the underlying neurochemical conditions that drive depression.
Why Smoking Temporarily Helps Depression
Nicotine produces short-term increases in dopamine and serotonin — the neurotransmitters most directly involved in depression. It also activates acetylcholine receptors involved in alertness and mood. For someone who is depressed, a cigarette can feel like genuine, if brief, relief.
The problem is that this relief is temporary and creates a withdrawal cycle. Between cigarettes, dopamine and serotonin fall below their pre-smoking baseline — worsening baseline mood. The person smokes to get back to normal, which becomes harder over time as tolerance develops. The result is chronic mood dysregulation with brief spikes of relief.
Does Quitting Smoking Worsen Depression?
Temporarily, possibly — especially in the first 2–4 weeks of cessation. Withdrawal from nicotine causes low mood, anhedonia (reduced pleasure), and irritability. For people with pre-existing depression, this can feel like a depressive episode.
However, multiple studies show that depression outcomes at 6+ months are better in ex-smokers than in current smokers. A major 2014 meta-analysis by Taylor et al. found that quitting smoking was associated with reduced depression, anxiety, and improved quality of life at 6 months and beyond. The temporary worsening should not be interpreted as evidence that smoking is beneficial for depression.
Quitting Smoking With Depression: What Works
Bupropion (Zyban/Wellbutrin) is uniquely well-positioned for this population — it is both an FDA-approved smoking cessation medication and an antidepressant. It increases dopamine and norepinephrine, partially replacing the neurochemical effect of nicotine, while treating depression simultaneously.
Varenicline (Chantix) is the most effective single cessation agent but was previously avoided in patients with psychiatric conditions due to early black-box warnings. These warnings were removed in 2016 after the EAGLES trial found no significant psychiatric adverse events. Varenicline is now considered appropriate with monitoring for people with depression.
CBT (Cognitive Behavioral Therapy) addresses both depression and smoking cessation skills simultaneously and is particularly effective for this population.
Frequently Asked Questions
Does smoking cause depression?
Research shows smoking is associated with increased depression risk — longitudinal studies find smokers are more likely to develop depression than non-smokers over time. The mechanisms include: nicotine withdrawal cycles that chronically dysregulate dopamine and serotonin; inflammatory effects of smoking that affect brain function; and the shame and self-image effects of addiction. The relationship is bidirectional — depression also increases smoking risk.
Does quitting smoking help depression?
Long-term, yes — quitting smoking is associated with improved depression outcomes. A 2014 meta-analysis found ex-smokers had significantly lower depression scores than current smokers at 6+ months after quitting. Short-term (the first 2–4 weeks), withdrawal can temporarily worsen depressive symptoms. The long-term benefit outweighs the temporary worsening, and treating cessation and depression simultaneously with bupropion is particularly effective.
Why do people with depression smoke more?
People with depression smoke at roughly twice the general population rate, likely because: nicotine temporarily boosts dopamine and serotonin (relief from depressive anhedonia); smoking serves as a coping mechanism and social ritual; people with depression are more likely to have started smoking to manage mood; and the short-term neurochemical relief, while temporary, is real and reinforcing. This is understandable self-medication that ultimately worsens the underlying condition.
What is the best medication to quit smoking if you have depression?
Bupropion (brand names Zyban for cessation, Wellbutrin for depression) is the first-line choice for people with comorbid depression and smoking — it is simultaneously an FDA-approved smoking cessation medication and an antidepressant. Varenicline (Chantix) is the most effective single cessation agent and is now considered appropriate for people with depression following the 2016 EAGLES trial. A psychiatrist or doctor familiar with both conditions should guide the choice.
Can quitting smoking make depression worse?
Temporarily, yes — nicotine withdrawal (first 2–4 weeks) includes low mood, anhedonia, and irritability that can worsen or mimic depression. For people with pre-existing depression, this window requires careful management. However, research consistently shows depression improves at 6+ months after quitting. The temporary worsening is not a reason to avoid quitting — it is a reason to manage the cessation period with appropriate medication and support.
What is the relationship between nicotine and serotonin?
Nicotine stimulates nicotinic acetylcholine receptors that influence serotonin release in the brain. In the short term, this increases serotonin availability, which can improve mood. With chronic use, the serotonin system adapts — receptors downregulate and baseline serotonin signaling is altered. Between cigarettes, serotonin drops below pre-smoking baseline, worsening mood. This cycle is one mechanism by which smoking chronically worsens depression despite providing momentary relief.
Does nicotine affect dopamine?
Yes — nicotine activates the same dopamine pathways as drugs of abuse, producing rapid dopamine release in the nucleus accumbens (the brain's reward center). This is the primary mechanism of nicotine's mood-elevating and addictive effects. With chronic use, dopamine receptors downregulate — creating tolerance and a lowered baseline mood between cigarettes. Cessation initially produces dopamine deficit (anhedonia, low motivation) that recovers as receptors resensitize.
How do I quit smoking if I have depression?
Quitting smoking with depression: work with a doctor or psychiatrist to choose the right cessation medication (bupropion is first-line for comorbid depression); consider CBT (effective for both depression and cessation); plan for a potentially harder first 2–4 weeks (inform your mental health provider you're quitting so they can monitor); use NRT to reduce withdrawal severity; maintain your antidepressant regimen if you're on one; and build in extra support during the cessation window.
Is depression a side effect of quitting smoking?
Temporary depressive symptoms (low mood, anhedonia, irritability) are common during nicotine withdrawal — they affect about 30% of people who quit smoking. For most people without pre-existing depression, these symptoms resolve within 2–4 weeks. For people with pre-existing depression, withdrawal can trigger a more significant depressive episode. Pre-treating with bupropion (which also treats depression) or monitoring closely with a psychiatrist reduces this risk.
Does smoking worsen mental health long-term?
Yes — despite providing short-term neurochemical relief, smoking worsens mental health long-term through: chronic dopamine and serotonin dysregulation via the withdrawal cycle; inflammatory effects on the brain; disrupted sleep; and the shame and self-image effects of addiction. Multiple large studies show ex-smokers have better mental health outcomes than current smokers. The mental health benefits of quitting are particularly strong for people with pre-existing depression and anxiety.
What is the EAGLES trial and what did it show about quitting smoking and mental health?
The EAGLES trial (2016) was a large randomized controlled trial that directly addressed fears about psychiatric adverse effects of smoking cessation medications in patients with psychiatric conditions. It found that varenicline (Chantix) was effective for cessation in patients with depression, anxiety, schizophrenia, and bipolar disorder, with no significant increase in serious psychiatric adverse events compared to placebo. This led to the removal of the black-box psychiatric warning for varenicline.
Can antidepressants help with smoking cessation?
Yes — bupropion (an antidepressant) is FDA-approved for smoking cessation. It works by blocking reuptake of dopamine and norepinephrine, partially replacing the neurochemical effects of nicotine. For people already on antidepressants for depression, adding bupropion (if not already taking it) or varenicline for cessation is supported by clinical guidelines. SSRIs and SNRIs do not have established cessation efficacy beyond their antidepressant effects.
What are the mental health benefits of quitting smoking?
Mental health benefits of quitting smoking (at 6+ months): reduced depression and anxiety symptoms; improved quality of life ratings; better sleep quality; reduced irritability; improved sense of self-efficacy and self-image; and for many people, the removal of the shame and cognitive burden of addiction. These benefits have been documented in large meta-analyses and are consistent across populations including those with pre-existing mental health conditions.
How does smoking affect sleep and depression?
Smoking disrupts sleep through: nicotine's stimulant effects reducing sleep quality; withdrawal-related arousal during sleep (particularly in the early morning, driving early-morning craving); and carbon monoxide reducing sleep oxygen levels. Poor sleep is both a cause and consequence of depression. Quitting smoking typically improves sleep quality after the first 2–3 weeks of cessation (initial disruption is common), which in turn improves depressive symptoms.
Is there a link between smoking and suicidal thoughts?
Smoking is associated with elevated rates of suicidal ideation in epidemiological studies — likely mediated by the relationship between smoking and depression, impulsivity, and substance use rather than a direct causal mechanism. The association is stronger in heavy smokers. Quitting smoking is not associated with increased suicidal ideation in clinical trials, including the EAGLES trial which specifically assessed this in psychiatric patients.
What should I do if quitting smoking makes me feel very depressed?
If depression worsens significantly during smoking cessation: contact your doctor or mental health provider immediately — do not wait for symptoms to resolve on their own; consider bupropion if not already using it; do not stop any prescribed antidepressants; maintain social connection and activity despite low mood; use NRT to reduce withdrawal intensity; and know that this is temporary. If you experience thoughts of self-harm, contact a crisis line or emergency services.
Can I quit smoking while on antidepressants?
Yes — quitting smoking while on antidepressants is safe and generally beneficial. Note: some antidepressants (particularly TCAs and some SSRIs) are metabolized faster in smokers due to enzyme induction from smoking. When you quit, blood levels of these medications may increase — your doctor may need to adjust your dose. Always inform your prescribing doctor that you are quitting smoking so they can monitor medication levels if relevant.
What is the smoking-depression bidirectional relationship?
The bidirectional relationship means: depression increases risk of starting smoking (and makes quitting harder); and smoking increases risk of developing depression over time. Both directions have causal evidence from longitudinal studies. This creates a self-reinforcing cycle where depression drives smoking, smoking worsens the neurochemical conditions underlying depression, and worsening depression drives more smoking. Breaking the cycle requires treating both simultaneously rather than sequentially.
Where can I get help quitting smoking if I have depression?
Resources: your primary care doctor or psychiatrist (for bupropion or varenicline prescription); 1-800-QUIT-NOW (free telephone quit line with behavioral counseling); nicotine replacement therapy (OTC at any pharmacy); the Forge app (streak tracking and AI coaching); and the SAMHSA helpline (1-800-662-4357) for referrals to integrated smoking and mental health treatment. The most effective approach combines medication, behavioral support, and mental health treatment.
What antidepressants are used to help people quit smoking?
Bupropion (Wellbutrin/Zyban) is an FDA-approved antidepressant for smoking cessation — it reduces withdrawal symptoms and craving independent of its antidepressant effects. It is particularly effective for smokers with depression or a history of depression. Nortriptyline (a tricyclic antidepressant) has also shown efficacy for cessation but is a second-line option due to its side effect profile. SSRIs (such as fluoxetine or sertraline) are not specifically approved for cessation but may support quitting in smokers with co-occurring major depression. Any prescription for cessation should be managed by a physician.
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