Quitting Smoking While Pregnant: Safety Guide

If you’re reading this, you’re already doing the right thing. The decision to quit smoking pregnant — or even to research it — puts you ahead of where most people start. Around 10% of women in the UK smoke during pregnancy (NHS Digital, 2023), and every single one of them faces a version of the same question: what’s the safest way to stop?

The answer isn’t as simple as most advice makes it sound. “Just stop” ignores withdrawal. “Use NRT” glosses over the fact that nicotine itself crosses the placenta. And “switch to vaping” — advice that’s genuinely gaining traction — has almost no long-term safety data for pregnancy.

This guide breaks it down trimester by trimester. What the evidence actually says about each method. What your midwife might not have time to explain in a ten-minute appointment. And what to do if you’ve already tried and relapsed — because that’s normal, and it doesn’t make you a bad parent.

Why Quitting During Pregnancy Matters More Than Any Other Time

Cigarette smoke contains over 7,000 chemicals. At least 70 are known carcinogens. When you smoke during pregnancy, carbon monoxide and nicotine cross the placenta directly — reducing oxygen delivery to the foetus and constricting blood vessels in the umbilical cord.

The consequences are well-documented:

• Miscarriage and stillbirth: Smoking increases the risk of miscarriage by 24–32% (Pineles et al., 2014, Human Reproduction Update). Risk of stillbirth roughly doubles.
• Preterm birth: Smokers are 30–40% more likely to deliver before 37 weeks (Hackshaw et al., 2011, BMJ).
• Low birth weight: Average reduction of 150–250g. This isn’t cosmetic — low birth weight increases risk of neonatal complications and long-term health problems.
• Placental abruption: The placenta partially or fully detaches from the uterine wall. Medical emergency. Risk doubles in smokers.
• SIDS: Sudden infant death syndrome risk is 2–3 times higher in babies whose mothers smoked during pregnancy (NHS).
• Long-term effects on the child: Increased rates of asthma, obesity, behavioural problems, and reduced lung function extending into adolescence (Hofhuis et al., 2003).

The good news: quitting at any point during pregnancy reduces these risks. The earlier, the better — but “late” is still far better than “never.”

The Nicotine Problem: Why This Isn’t Simple

Here’s where pregnancy makes quitting uniquely complicated. With any other population, the advice is straightforward: if cold turkey is too hard, use nicotine replacement therapy. NRT is safe, effective, and available over the counter.

During pregnancy, NRT is probably safer than smoking — but it isn’t risk-free. Nicotine itself is a vasoconstrictor. It narrows blood vessels, including those supplying the placenta. Animal studies show nicotine exposure during foetal development can affect brain development, lung maturation, and cardiovascular function (Bruin et al., 2010, Women’s Health).

The key distinction: smoking delivers nicotine plus carbon monoxide plus thousands of other toxins. NRT delivers nicotine alone. It’s the difference between being hit by a lorry and being hit by a bicycle — neither is ideal, but one is dramatically less dangerous.

This is why every major guideline — NICE, the Royal College of Obstetricians and Gynaecologists (RCOG), the ACOG in the US — recommends trying to quit without NRT first, but using NRT if the alternative is continued smoking. The hierarchy is:

1. Best: Quit without nicotine (behavioural support, cold turkey)
2. Good: Quit with NRT
3. Worst: Continue smoking

There is no scenario where continuing to smoke is the safer option.

What About Vaping During Pregnancy?

This is the question that’s poorly answered almost everywhere. Here’s why: we don’t have enough data.

Vaping eliminates combustion, which removes carbon monoxide and most of the 7,000+ chemicals in cigarette smoke. For non-pregnant adults, the NHS states that vaping is “substantially less harmful” than smoking. But “substantially less harmful” is not the same as “safe for a developing foetus.”

The specific concerns with vaping during pregnancy:

• Nicotine delivery: Modern vapes (especially those using nicotine salts) can deliver nicotine concentrations equal to or exceeding cigarettes. The effects of nicotine on the brain are well-documented in adults — in a foetus, the developing nervous system is far more vulnerable.
• Propylene glycol and vegetable glycerine: Generally recognised as safe for ingestion, but inhalation during pregnancy hasn’t been studied in controlled trials.
• Flavouring chemicals: Some (like diacetyl) are known respiratory irritants. Their effects on foetal development are unknown.
• No long-term pregnancy outcome data: As of 2026, there are no large randomised controlled trials of vaping during pregnancy. The data that exists is observational, small, and often confounded by dual use (vaping and smoking).

The RCOG position (2024): If a pregnant woman cannot quit using behavioural support or licensed NRT, switching to vaping may be less harmful than continuing to smoke — but this should be a last resort, not a first-line approach.

What this means practically: Don’t switch to vaping as your first quit strategy during pregnancy. Try behavioural support first. Try NRT if needed (under medical supervision). If you’re still smoking after those attempts, vaping may be considered — but discuss it with your midwife or GP first.

Trimester-by-Trimester Guide

First Trimester (Weeks 1–12): The Highest-Impact Window

This is when your baby’s major organs form. Neural tube closure, heart development, limb formation — the architectural blueprint is laid down in the first 12 weeks. Smoking during this period has the strongest association with congenital abnormalities and miscarriage.

What to do:

• Quit as early as possible. If you’ve just found out you’re pregnant and you smoke, today is the best day to stop. Not “after the first scan.” Not “once I feel settled.” Now.
• Start with behavioural support. Contact the NHS Stop Smoking Service (or your country’s equivalent). Pregnancy-specific counselling is available and it’s free. These services roughly double your chances of success compared to going it alone.
• Consider going cold turkey. If you’re a lighter smoker (under 10 per day), cold turkey with proper preparation can work well. The acute withdrawal period — the worst three to five days — is the same whether you’re pregnant or not. Understanding what nicotine withdrawal actually feels like removes a lot of the fear.
• If cold turkey fails, discuss NRT with your GP. NICE guidelines recommend intermittent NRT (gum, lozenges, inhalers) over patches during pregnancy. Why? Intermittent forms deliver nicotine in bursts rather than continuous exposure, reducing total foetal nicotine exposure over 24 hours. If a patch is preferred, the 16-hour patch (removed at night) is recommended over the 24-hour version.

What to expect: Morning sickness can actually reduce cigarette cravings in some women — the nausea makes smoking physically unpleasant. If that’s happening, use it. Your body is giving you an assist.

Second Trimester (Weeks 13–26): Still Massive Benefits

If you didn’t manage to quit in the first trimester, don’t spiral. Quitting now still significantly reduces risks of preterm birth, low birth weight, and placental complications. A 2009 study in BJOG found that women who quit before 15 weeks had birth outcomes comparable to non-smokers. But even quitting at 20 or 24 weeks measurably improves foetal growth.

What to do:

• Re-engage with stop smoking services. If you tried and relapsed, tell them. They’ve seen it before. A 2017 Cochrane review found that psychosocial interventions during pregnancy increased quit rates by 35% (Chamberlain et al., 2017).
• Use the anatomy scan as motivation, not guilt. Around week 20, you’ll have a detailed ultrasound. Many women report this as a motivational turning point. Channel that into action — set your quit date for the week of or after the scan.
• NRT is still an option. The risk-benefit calculation hasn’t changed. If the choice is NRT or cigarettes, NRT remains the better option. Your midwife can prescribe it.
• Track what you’re saving. At 10 cigarettes a day, you’re spending roughly £150–180 per month. By the time your baby arrives, that’s £500+ back in your pocket. Our savings calculator can show you the exact figure — it’s a surprisingly effective motivator.

What to expect: Many women find the second trimester emotionally easier — morning sickness fades, energy returns. But stress and anxiety about the pregnancy itself can trigger cravings. Have a plan for those moments that doesn’t involve nicotine.

Third Trimester (Weeks 27–40): Every Day Counts

Your baby is gaining weight rapidly now — about 200g per week in the final months. Smoking restricts the oxygen and nutrients available for this growth. Quitting in the third trimester still reduces the risk of low birth weight and improves oxygen delivery during labour.

What to do:

• Quit now if you haven’t already. There is no point at which it’s “too late to bother.” Even quitting at 32 weeks has measurable benefits.
• Prepare for the postpartum trigger. Many women who quit during pregnancy relapse after delivery. The combination of sleep deprivation, hormonal shifts, stress, and the loss of pregnancy as a motivator creates a perfect storm. Start building your postpartum quit-maintenance plan now.
• If you’re using NRT, discuss the timeline with your GP. Some women taper off NRT before delivery; others continue into the postpartum period to prevent relapse. There’s no single correct answer — it depends on your dependence level and circumstances.
• Brief your birth partner. They should know you’ve quit, know your triggers, and know not to smoke around you in the days after delivery. Secondhand smoke exposure in newborns is a SIDS risk factor.

What to expect: Shortness of breath is common in late pregnancy anyway (the uterus pushes up against the diaphragm). If you’ve recently quit, you may not notice the respiratory improvement as clearly — but it’s there, and your baby’s oxygen supply is better for it.

NRT During Pregnancy: The Practical Details

If you and your healthcare provider decide NRT is appropriate, here’s what to know:

Recommended forms (in order of preference during pregnancy):

1. Nicotine gum or lozenges — intermittent dosing, lower total daily nicotine exposure
2. Nicotine inhaler — mimics the hand-to-mouth action, intermittent delivery
3. Nicotine patch (16-hour) — if you need steady background relief; remove before bed
4. Nicotine nasal spray — fast-acting but higher nicotine peaks; discuss with GP

Not recommended during pregnancy:

• 24-hour patches (continuous foetal nicotine exposure overnight when you wouldn’t normally be smoking)
• Any unlicensed nicotine product (including most vapes)
• Varenicline (Champix) — not studied in pregnancy; not recommended
• Bupropion (Zyban) — limited data; generally avoided

Duration: NRT during pregnancy is typically prescribed for 8–12 weeks. If you need longer, your GP can extend it — the principle remains that NRT is preferable to relapse.

A note on dosing: Pregnancy increases your metabolic rate, which means nicotine is cleared from your body faster. Some women find standard NRT doses feel weaker than expected. Discuss this with your prescriber rather than doubling up on your own.

For a deeper dive into how each NRT form works, read our complete NRT guide.

What If You Relapse?

First: relapse during a pregnancy quit attempt is common. Studies report relapse rates of 50–80% during pregnancy (Orton et al., 2018). You are not failing. You are doing something genuinely difficult while your body is already under extraordinary physiological stress.

Second: a relapse is not a reason to give up. Every cigarette you don’t smoke is a cigarette your baby doesn’t have to process. Reducing from 15 to 3 per day is not “still smoking” — it’s an 80% reduction in exposure.

Third: get support immediately. Don’t wait until your next midwife appointment. Call the NHS Smokefree helpline (0300 123 1044) or your local stop smoking service. The sooner you get back on track, the better.

If your current approach isn’t working, it may be time to change strategy. Our complete guide to quitting covers every evidence-based method available — read it and discuss the options with your healthcare team.

Frequently Asked Questions

Can I use nicotine pouches (like ZYN) during pregnancy?

Nicotine pouches are not licensed NRT products and have not been studied in pregnant populations. They deliver nicotine, which carries the same placental transfer concerns as any nicotine source. If you want oral nicotine, use licensed nicotine lozenges or gum instead — these have known dosing and some (limited) pregnancy safety data. Always discuss with your GP or midwife first.

Is cutting down better than quitting outright?

Quitting completely is always the goal. However, smokers who cut down often unconsciously compensate by inhaling more deeply or smoking each cigarette more intensely. A 2006 study in Nicotine & Tobacco Research found that halving cigarette consumption only reduced cotinine levels (a nicotine metabolite) by 25%, not 50%. That said, genuine reduction is better than no reduction. If you can’t quit yet, cut down while you build towards a full quit date.

My partner smokes. How do I manage this?

Secondhand smoke during pregnancy carries independent risks — increased preterm birth, low birth weight, and childhood respiratory problems. Ideally, your partner quits with you. If they won’t, establish firm rules: no smoking inside the home, no smoking in the car, hand-washing after smoking before touching you. After delivery, these rules become even more critical for SIDS prevention.

I quit when I found out I was pregnant but I’m craving constantly. Is this normal?

Completely normal. Pregnancy hormones don’t eliminate nicotine cravings — in some women, the stress and emotional volatility of pregnancy actually intensifies them. The cravings will peak in the first two to four weeks after quitting and then gradually diminish. Physical withdrawal typically resolves within three to six weeks. Psychological cravings may persist longer but become less frequent and less intense over time.

Will quitting cause stress that harms the baby?

This is a common concern — and sometimes used as a justification to keep smoking. The evidence is clear: the physiological harm from smoking far outweighs any stress response from quitting. A 2014 Cochrane review found no evidence that smoking cessation during pregnancy increases stress, anxiety, or depression to levels that harm the foetus. Withdrawal is uncomfortable. It is not dangerous to your baby.

I’m pregnant and vaping — should I switch to NRT or just quit everything?

If you can quit nicotine entirely with behavioural support, that’s the best option. If you need a nicotine substitute, licensed NRT (gum, lozenges, patches) is preferred over vaping during pregnancy because NRT products have standardised dosing and more safety data. Vaping products vary enormously in nicotine content, and most contain additional chemicals that haven’t been studied in pregnancy. Talk to your midwife about making the switch.

Medical Disclaimer

This article is for informational purposes only and does not constitute medical advice. Pregnancy is a high-stakes medical context. Every woman’s health situation is different — your smoking history, your general health, your pregnancy risk factors, and your mental health all affect which quit approach is safest for you.

You must consult your GP, midwife, or obstetrician before starting or stopping any nicotine product during pregnancy. This includes licensed NRT. Do not self-prescribe based on a blog post — including this one.

If you are currently pregnant and smoking, contact your local NHS Stop Smoking Service or call the Smokefree helpline on 0300 123 1044. These services are free, confidential, and staffed by specialists who understand the specific challenges of quitting during pregnancy.

You’re Already Doing the Hard Part

The fact that you’ve read this far means you care. That matters more than you think.

Quitting smoking during pregnancy is not about being perfect. It’s about giving your baby — and yourself — the best possible start with the tools and support available to you. If you’ve tried before and it didn’t stick, that doesn’t define you. What defines you is that you’re still trying.

If you want structured support to track cravings, build quit strategies, and stay accountable, join Cravo. We’re building the app we wish existed for people facing exactly this.

“The best time to quit was before you got pregnant. The second best time is today.”