Quitting Smoking, Anxiety and Depression

If you smoke to cope with anxiety or low mood, the thought of quitting can feel like removing the one thing keeping you steady. It’s worth knowing that the research points the other way: for most people, mental health gets better after quitting — not worse.

That doesn’t mean the first few weeks are effortless. There’s an honest early dip while your brain readjusts, and pretending otherwise helps no one. Below is the real arc — the short-term rough patch, the longer-term improvement, and what the evidence actually shows.

Does smoking actually relieve stress? (The myth, busted)

Smoking doesn’t relieve underlying stress — it relieves the withdrawal that nicotine itself creates. This is the single most important thing to understand, because it reframes everything else.

Here’s the loop. Nicotine leaves your body fast, so within an hour or two of your last cigarette, blood levels drop and a low hum of withdrawal begins — restlessness, irritability, a creeping edge of anxiety. The next cigarette makes that feeling vanish, and your brain files it as “smoking relieves stress.” But the “stress” it relieved was withdrawal from the previous cigarette. The relief is the cycle, not a cure.

That’s why smokers often have higher background anxiety than non-smokers, not lower. You’re not medicating life’s stress; you’re topping up to stave off the discomfort of the last dose wearing off. Break the cycle, and the background tension it created goes away — it doesn’t need topping up anymore.

It helps to notice how tightly the “stress relief” is tied to timing rather than to actual stressful events. The cigarette that feels most urgent is usually the first of the morning, or the one after a long stretch without smoking — moments defined by how long it’s been since the last dose, not by how hard life is at that instant. That timing is the tell: what you’re relieving is a chemical clock, not a genuine spike in life stress.

Does quitting smoking make anxiety and depression worse at first?

Often, yes — temporarily. Honesty matters here: the early weeks of quitting can feel like your mental health is dipping, and for a lot of people that’s real. Anxiety, irritability and low mood are genuine, well-documented withdrawal symptoms.

According to the National Cancer Institute, anxiety “builds over the first 3 days” after quitting and “may last several weeks.” Irritability and feeling down follow a similar early curve. The CDC lists anxiety, irritability and difficulty concentrating among the most common withdrawal symptoms in the first days and weeks.

This is the part that traps people. The dip is real, so it’s easy to conclude “I clearly need cigarettes for my mental health” — when what you’re actually feeling is short-term withdrawal, not your true baseline. Here’s how the early arc typically plays out:

The key move is to expect the dip, name it as withdrawal, and treat it as the rough patch it is — not evidence that you should smoke. If low mood or anxiety is severe, or it isn’t easing after several weeks, that’s a signal to get support (see below), not to relight.

Does quitting smoking improve mental health long term?

Yes — and the evidence is strong. Once you’re past the withdrawal dip, quitting is consistently linked to better mental health, not worse.

A widely cited review in the BMJ (Taylor et al., 2014) analysed 26 studies and found that stopping smoking is associated with reduced depression, anxiety and stress, and improved positive mood and quality of life, compared with continuing to smoke. The authors reported that the effect sizes were “equal or larger than” those of antidepressant treatment for mood and anxiety disorders. That’s a striking benchmark — but read the comparison precisely. The study compared quitting to continuing to smoke; it did not test quitting against taking antidepressants, and it is not a reason to change or stop any prescribed medication. If you’re on treatment for anxiety or depression, talk to your doctor before altering it.

Crucially, the benefit held for people with psychiatric conditions, not just the general population — an important finding, because smokers with anxiety or depression are often told (or assume) that quitting will destabilise them. A Cochrane review examining smoking cessation and mental health likewise found that quitting was associated with improvements in anxiety, depression and stress rather than deterioration.

So the long-term picture is the reverse of the myth:

• Anxiety: lower after quitting than while smoking
• Depression: reduced, not increased
• Stress: down, with better overall mood and quality of life
• For people with mental-health conditions: the improvement still applies, and quitting doesn’t undermine treatment

The mechanism fits the myth-busting above: remove the withdrawal cycle, and you remove a recurring source of anxiety you may not have realised was there.

It’s worth being clear about what this evidence does and doesn’t say. It doesn’t claim quitting cures a diagnosed anxiety disorder or depression — those often need their own treatment. What it shows is that, on average and over time, quitting is associated with better mental-health measures than continuing to smoke, and that the long-feared “smoking is protecting my mental health” trade-off doesn’t hold up. If anything, the studies suggest smokers are carrying an extra load they’ve learned to attribute to life rather than to nicotine. A note on the research itself: most of these are observational studies, so they show a strong, consistent association rather than proving cause and effect single-handedly — but the direction is clear and it points away from the myth, not toward it.

Putting it together: the honest arc

Quitting smoking and mental health isn’t a straight line up — it’s a dip then a rise:

1. Short term (first weeks): withdrawal can make anxiety, irritability and low mood worse. Anxiety builds over the first three days and can last several weeks. This is real, and it passes.
2. Longer term: mental health improves — lower anxiety, depression and stress, with a benefit comparable to antidepressants, and it holds for people with existing conditions.

The trap is mistaking step 1 for the whole story. If you can get through the withdrawal window — which is exactly the same window covered in our guide to cigarette withdrawal symptoms — you land somewhere better than where you started. (If you’re quitting vaping rather than cigarettes, the same anxiety question comes up, and we cover it in does quitting vaping cause anxiety.)

A safety note — when to get support

Getting help isn’t a sign the quit is failing — it’s how you protect it. Managing the low points well is also one of the strongest defences against relapse; our guide on how to avoid relapse after quitting smoking goes deeper on riding out hard moments without smoking.

Getting through the dip

You don’t need to white-knuckle the anxiety — you need a few tools for the minutes that spike hardest:

• Name it as withdrawal. “This is my brain readjusting, not my real baseline” is a genuinely useful reframe when anxiety rises.
• Ride the wave. An individual craving or anxiety spike usually crests and passes in a few minutes. Delay and breathe rather than fight it.
• Use grounding. The 5-4-3-2-1 method (five things you see, four you hear, and so on) pulls attention out of the spiral and into the room.
• Move. A short walk reliably takes the edge off both anxiety and cravings.
• Protect your sleep. Poor sleep amplifies everything in the early weeks; it usually settles within one to two weeks.
• Don’t quit the support with the cigarettes. Keep your usual routines, people and, if relevant, your medication and clinician in the loop.

Keel Habit is built for exactly these moments — its Craving SOS gives you breathing and 5-4-3-2-1 grounding for the minutes that matter, and its recovery timeline shows you where you are on the curve, so the early dip reads as a stage you’re passing through rather than a verdict on your mental health.

Sources & method. The mental-health figures here are drawn from the sources cited inline: the BMJ review by Taylor and colleagues (2014) on smoking cessation and mental health, a Cochrane review on the same question, the National Cancer Institute withdrawal fact sheet, and the CDC on common withdrawal symptoms. This article is general education, not medical advice — if anxiety or low mood is severe or lasting, talk to a doctor, and in the US you can call or text 988 anytime.