Is Vaping Safer Than Smoking Before IVF? An Honest Look at the Evidence

Evidence-based · Written by Dr. Lejla Fazlicic, D.Ac, L.Ac · All key claims cited to peer-reviewed research · Last reviewed October 2026

The asymmetry is in how much has been studied. Smoking has a large, well-replicated association with lower IVF live birth, reduced sperm count and motility, and the single largest lifestyle contribution to sperm DNA fragmentation identified in a 190-study review. Vaping has almost nothing: the total clinical evidence base on e-cigarettes and female reproduction is five studies, the human male evidence is one cross-sectional study, and the one study touching vaping and IVF outcomes has no non-nicotine control group. What we do know points away from treating vapes as a safe harbour — snus, which delivers nicotine with no combustion whatsoever, was associated with a 24% lower total sperm count in a cotinine-verified study of 613 men.

Working out how to actually get there — for whichever of you is using — is the hard part.

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One thing first. If either of you smokes or vapes, this article is not here to add shame to a cycle that already costs $15–35,000 and a great deal of hope. Nicotine dependence is a medical condition with medical treatments, and the evidence below is clear that advice alone rarely changes it. Naming what to build is more useful than listing what to forbid.

What does smoking actually do to an IVF cycle?

This is the best-established part of the whole lifestyle literature, and it is worth stating precisely rather than dramatically.

The most recent and most carefully constructed meta-analysis pooled 26 studies and 16,359 participants using autologous oocytes. Active smoking was associated with a live birth relative risk of 0.85 and a clinical pregnancy relative risk of 0.82, graded moderate certainty (Malasevskaia et al., 2026). Older meta-analyses report considerably larger effects — live birth odds ratios of 0.54 and 0.59 across 21 and 26 studies respectively (Waylen et al., 2009; Budani & Tiboni, 2018).

Here is the honesty that matters, and the 2026 authors put it in their own abstract: when the analysis was restricted to comparisons against strict never-smokers, rather than control groups that mixed never-smokers with former smokers, both live birth and clinical pregnancy attenuated to a relative risk of 0.88 and lost statistical significance. The association is real. Its size depends heavily on who you compare against.

Smoking has also been associated with earlier menopause. The pooled estimate across 46 studies in 24 countries is a mean difference of 0.91 years — about one year, not the "one to four years" often quoted (Schoenaker et al., 2014).

On the male side

A meta-analysis of 20 studies and 5,865 men found smoking associated with a sperm count reduction of 9.72 million per mL, motility down 3.48 percentage points and normal morphology down 1.37 points — with larger effects in infertile men and in heavier smokers (Sharma et al., 2016). In a population-based study of 1,222 men, heavy smokers (more than 10 a day) showed reduced volume, count, concentration and motility alongside increased sperm DNA fragmentation and reduced serum and seminal zinc (Osadchuk et al., 2023). One caveat the authors emphasise and most summaries drop: those effects appeared only in the Slav subgroup, with no significant changes detected in smoking Buryats. They read their own result as ethno-specific, and it has not been replicated.

And in the largest synthesis of what actually drives sperm DNA fragmentation — 190 studies — smoking was the largest modifiable lifestyle contributor identified, at +9.19 percentage points, in the same territory as air pollution and approaching varicocele (Szabó et al., 2023). If DNA fragmentation is the number you are watching, this is the input with the strongest claim on your attention. A caveat on the measure itself: NICE guideline NG257 advises against routine sperm DNA fragmentation testing, so this is a conversation to have with your own clinician rather than a test to order online. We cover what the test does and costs in the sperm DNA fragmentation test guide.

Secondhand smoke is not a footnote

In 3,270 IVF cycles among 1,909 women who did not smoke, exposure measured as cotinine in follicular fluid — a biological marker, not a questionnaire — was associated with implantation failure at odds ratio 1.52 and live birth at odds ratio 0.75 (Benedict et al., 2011). A smaller study found pregnancy rates per transfer of 19.4% in active smokers, 20.0% in passively exposed women and 48.3% in unexposed women, with no difference in embryo quality between groups (Neal et al., 2005).

That second finding is the one to sit with: normal-looking embryos, and a different implantation outcome. It is also the clearest argument that this is a shared-household question rather than an individual one. Same window. Same clock. Same team.

So is vaping safer for fertility?

Let us be exact about how little is known, because the honesty here is the answer.

A 2026 PRISMA systematic review searched the entire literature on e-cigarettes and female reproduction and found eleven studies in total — six experimental, five clinical. Its conclusion, verbatim: "Clinical evidence remains scarce, suggesting possible associations between e-cigarette smoking and reduced ovarian reserve and fecundability in naturally conceiving women. No conclusive associations have been identified with in vitro fertilization outcomes" (Budani & Tiboni, 2026). A separate systematic review of the genitourinary effects of vaping screened 244 articles, included 28, and found that only three of the 28 reported on reproductive outcomes at all (Bandara et al., 2023).

What those few human studies found:

Every human study of vaping and a reproductive outcome, and how much weight each one carries

Study	What it measured	Result	Weight to give it
Holmboe 2020, 1,221 Danish men	Semen quality, testosterone	Daily e-cigarette users: total sperm count 91 million vs 147 million in non-users	One cross-sectional study, small daily-user subgroup, median age 19, heavy overlap with cigarette smoking. Authors themselves call for replication.
Harlow 2021, 4,586 women (PRESTO)	Fecundability	Current use: fecundability ratio 0.84 — but the confidence interval crosses the null	Authors describe their own estimates as "inconsistent and imprecise." Only 4% were current users.
Getreu 2026, 16,087 women	AMH and FSH	Current vaping: 5.6% lower AMH; current smoking 9.4% lower AMH and 7.7% higher FSH	Conducted by the company providing the hormone test. Cross-sectional. AMH is a reserve marker, not a fertility outcome.
Le 2025, 6,136 women + 1,688 male partners	Miscarriage	No association for either partner, former or current use	Genuinely null, but wide confidence intervals; few current vapers.
Kim 2025, 151 smokers vs 145 vapers in IVF	Live birth, sperm motility	Better in the vaping group	No non-nicotine control group. Compares vapers to smokers only. The live-birth difference did not survive multivariate analysis.
Galanti 2023, 410 women in ICSI	Oocyte and fertilisation outcomes	No significant difference between cigarette smokers and the e-cigarette/heat-not-burn group	Small pooled subgroup, no equivalence testing — absence of evidence, not evidence of equivalence.

Notice what is missing from that table: any study of vaping versus not using nicotine, with IVF live birth as the outcome. It does not exist.

Is it the nicotine, or the smoke?

This is the question that decides whether switching is enough, and the answer appears to be both.

Combustion products — polycyclic aromatic hydrocarbons, cadmium, carbon monoxide, benzene — clearly account for much of tobacco's effect, and removing them removes real exposure. But nicotine is not inert. Nicotinic acetylcholine receptors are expressed in testicular tissue, giving nicotine a direct receptor-mediated route to reproductive function independent of any smoke (Barbagallo et al., 2024).

The most informative human evidence comes from a product nobody talks about in fertility content. Swedish snus delivers nicotine orally with no combustion at all. In 613 general-population men with nicotine exposure verified by urinary cotinine and analyses adjusted for cigarette smoking, snus users had a 24% lower total sperm count and 14% higher testosterone; the authors estimated roughly a 10% lower chance of fathering a child (Kimblad et al., 2022).

The dashed link, honestly drawn: a different cohort of 1,221 Danish men found no association between snuff use and any marker of testicular function (Holmboe et al., 2020). Two studies, opposite conclusions. What survives that disagreement is a reasonable caution rather than a finding.

And there is a third possibility the experimental work keeps pointing at, which is that the concerning components may not be the nicotine at all. The 2026 systematic review reports that in experimental models, propylene glycol, vegetable glycerin and flavouring agents "appear to be key contributors" to impaired ovarian function and disrupted folliculogenesis. Flavourings are the least regulated and most variable part of any vape, and there are thousands of them. No human study has separated them.

The American Society for Reproductive Medicine's 2024 committee opinion on tobacco and marijuana use takes the same position: electronic nicotine delivery systems are widely marketed as a safe alternative to combustible cigarettes, early data suggest they are harmful to reproductive health, and because they still deliver nicotine, exposure to nicotine itself is not avoided by switching (ASRM Practice Committee, 2024).

What about nicotine pouches and heated tobacco?

There is no human study of nicotine pouches and any fertility, semen or IVF outcome. That is not a summary of weak evidence; it is an absence of evidence. Heated tobacco products have been included once, pooled with e-cigarettes in a small ICSI subgroup, plus rodent work.

The closest proxy for pouches is snus, and snus is where the 24% sperm count signal came from. Nicotine pouches should not be presented — by anyone — as a fertility-safe alternative, because nobody has looked.

Does cannabis affect sperm or IVF outcomes?

Briefly, and the honest answer is uncomfortable for everyone's priors.

The expected harm has repeatedly failed to appear. In 662 subfertile men across 1,143 semen samples, ever-users had higher sperm concentration than never-users — 62.7 versus 45.4 million per mL — with no association with sperm DNA integrity (Nassan et al., 2019). A meta-analysis of 9 studies found no significant increase in abnormal semen parameters (Belladelli et al., 2021). A preconception cohort of 4,194 women found little association with fecundability for either partner (Wise et al., 2018). An IVF cohort of 722 patients found no difference in implantation or ongoing pregnancy (Har-Gil et al., 2021). ASRM's own 2024 summary reaches the same place: marijuana use has not been consistently associated with fecundity, time to pregnancy, reproductive hormone levels, semen parameters or ART outcomes in either partner.

All of these rely on self-reported use with no dose or potency data, all are tangled with tobacco co-use, and the Nassan authors explicitly warn that chance findings cannot be excluded. "Not shown to harm IVF outcomes" is not "shown to be safe" — and it says nothing at all about use during pregnancy, where the guidance is unambiguous. We touch on this from the DNA fragmentation angle in daily habits linked to sperm DNA health.

How quickly does quitting help?

Faster than most people expect, and the timeline maps onto the biology.

In 60 men entering a cessation program with compliance monitored by urinary nicotine and two semen samples at each of three timepoints, total sperm count rose from 49.3 million to 70.2 million at three months and 84.0 million at six months. Progressive motility went from 20.7% to 35.3% to 42.3%. Abnormal morphology fell from 69.3% to 40.8%. Improvement correlated with time since cessation, and heavier smokers improved most (Ragheb et al., 2025).

That is a single-arm study with no control group, so regression to the mean and the other changes people make during a quit attempt cannot be separated out. It is also close to the only human cessation study that exists. The effect sizes are at least consistent with the measured sperm production cycle of about 64 days, range 42 to 76 — which is exactly why the window is months rather than weeks. (The conventional figure of 74 days is a calculation rather than a measurement; the isotope studies give 64.)

Why advice alone is not the plan

A Cochrane review of preconception lifestyle advice for people with infertility found that general advice covering several topics at once made essentially no difference to smoking cessation — a relative risk of 1.01 in men and 1.01 in women. And the trials of smoking-specific advice reported no live birth, no ongoing pregnancy and no usable behaviour-change data whatsoever (Boedt et al., 2021). Cessation pharmacotherapies such as nicotine replacement and varenicline are considerably more effective than advice alone, which is a conversation for a physician or a cessation service.

The takeaway is not "try harder." It is that this is one of the few inputs in the whole pre-IVF window with an actual clinical treatment attached, and it belongs with a physician or a structured cessation service.

What about "95% less harmful"?

You will have seen the figure. It comes from a 2015 UK public health estimate about overall harm from switching, in adults who already smoke — a harm-reduction comparison, made for a smoking population, about smoking-related disease. It was never a fertility finding, it has never been tested against any reproductive outcome, and it says nothing about nicotine's effects on testicular tissue or about propylene glycol, glycerin and flavourings. Using it to decide whether to keep vaping through an IVF cycle is applying a number to a question it was not built for.

What the evidence does not show

• No study anywhere compares vaping to not using nicotine with an IVF live birth outcome. The one IVF vaping study has no non-smoking control arm.
• The claim "vaping is safe for fertility" has never been tested. The claim "vaping is safer than smoking for fertility" rests on a single retrospective study with the wrong comparator.
• No dose-response, no duration-response, no device or formulation data. Every cohort lumps all vaping together despite enormous variation in nicotine salt concentration, wattage and coil metals.
• No human reproductive data on nicotine pouches at all.
• Snus and snuff studies contradict each other on whether non-combusted nicotine affects testicular function.
• No randomized evidence that quitting before IVF improves live birth. Cochrane found the trials did not even reliably change smoking behaviour, let alone outcomes.
• The smoking effect size itself is comparator-dependent — it attenuates to non-significance against strict never-smoker controls.

What we do with this

1. If either of you smokes, that is the highest-yield input in this entire article. Not because of guilt, but because it has the largest documented association with sperm DNA fragmentation of any modifiable lifestyle factor, and a moderate-certainty association with IVF live birth.
2. Aim to be off nicotine entirely, not switched to a different delivery device. If switching to vaping is the realistic step from where you are today, it is a step in the right direction — with an exit date attached.
3. Allow three to six months between quitting and the cycle where you can. Semen parameters improved from three to six months in the one cessation cohort available, consistent with a measured sperm production cycle of about 64 days.
4. Treat this as a medical question, not a willpower question. Advice alone barely moves behaviour in the trials; cessation medication and structured support are substantially more effective. Ask your physician.
5. Make it a household decision. Follicular-fluid cotinine in non-smoking women was associated with implantation failure. The exposure does not respect whose habit it is — and this is a reason to act together, never a reason to blame.
6. Do not treat pouches or heated tobacco as the safe option. Nobody has studied them.

If your cycle is closer than 3.5 months away, you work with the time you have. Some inputs matter even in the final weeks — and no window, used or unused, ever decided an outcome on its own.

Related reading

• Daily habits linked to sperm DNA health
• Sperm DNA fragmentation test: cost and results explained
• Alcohol before IVF: how long should you stop?
• His 50%: male factors in embryo quality
• What nobody can tell you yet about preparing for IVF
• The research library — smoking and vaping section

Frequently asked questions

Is vaping safer than smoking for fertility?

Almost certainly less harmful than smoking, but not established as safe and not a neutral choice. A 2026 systematic review found only eleven studies in total on e-cigarettes and female reproduction and concluded that no conclusive associations have been identified with IVF outcomes. The only study comparing vapers and smokers in IVF had no non-nicotine control group. ASRM's 2024 committee opinion states that early data suggest these products are harmful to reproductive health.

Does vaping affect sperm count?

One cross-sectional study of 1,221 Danish men found daily e-cigarette users had a total sperm count of 91 million compared with 147 million in non-users. That is the entire human male evidence base, it has not been replicated, the daily-user subgroup was small, the median age was 19, and many users also smoked cigarettes. The authors themselves called for replication before drawing conclusions.

Does vaping affect egg quality or ovarian reserve?

A cross-sectional study of 16,087 women found current vaping associated with 5.6% lower AMH compared with never-vapers, and current smoking with 9.4% lower AMH. Two caveats matter: all authors were employed by the company providing the hormone test, and AMH is a marker of ovarian reserve rather than a measure of egg quality or a fertility outcome. No study has examined vaping and egg quality directly.

Are nicotine pouches safe before IVF?

Nobody knows, because no human study of nicotine pouches and any fertility, semen or IVF outcome exists. The closest available proxy is Swedish snus, which delivers nicotine without combustion, and in 613 men with exposure verified by urinary cotinine it was associated with a 24% lower total sperm count. Nicotine pouches should not be presented as a fertility-safe alternative.

How long after quitting smoking do sperm improve?

In the only compliance-monitored cessation cohort available, 60 men showed total sperm count rising from 49 million at baseline to 70 million at three months and 84 million at six months, with progressive motility roughly doubling. That study had no control group, so treat it as encouraging rather than definitive. The timeline is consistent with the measured sperm production cycle of about 64 days, which is why three to six months before a cycle is a reasonable target.

Does secondhand smoke affect IVF success?

The evidence suggests it does. In 3,270 IVF cycles among 1,909 non-smoking women, exposure measured as cotinine in follicular fluid was associated with implantation failure at an odds ratio of 1.52 and live birth at an odds ratio of 0.75. A smaller study found pregnancy rates per transfer of 20.0% in passively exposed women versus 48.3% in unexposed women, with no difference in embryo quality between the groups.

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This article is educational and reflects associations reported in the scientific literature. It is not medical advice, not a diagnosis, and not a way to interpret your own results. As a Doctor of Acupuncture I offer lifestyle guidance that works alongside your physician and fertility clinic — I do not diagnose, interpret labs, or prescribe. Nicotine dependence is treatable, and that conversation belongs with your physician.