Can fertility improve after stopping smoking—and does better semen mean conception?

01

What the three- and six-month studies actually followed

In Kulaksiz and colleagues' 2022 study, men attending an infertility clinic were assigned according to whether they accepted smoking cessation, not at random. Of 130 enrolled, 90 remained in the analysis: 48 in the cessation group and 42 in the comparison group. At around three months, the cessation group had higher mean semen volume, sperm concentration and total sperm count than at baseline. Changes in motility and morphology were not statistically significant; that is not proof that those features can never change.

Ragheb and colleagues' 2025 study followed a different group volunteering for a cessation programme. Sixty of 69 enrolled participants completed follow-up. Several semen measures improved at three and six months, with urine cotinine checks at the study visits. There was no control group. The paper explicitly identifies the absence of pregnancy and live-birth outcomes as a limitation.

These are encouraging intermediate findings, with selection, losses to follow-up and possible other lifestyle changes limiting causal interpretation. Neither study randomly assigned people to quit or keep smoking. Their scheduled visits are observation points, not a promise that everyone is restored at three months or that six months produces a known conception probability. The studies' different motility and morphology findings also argue against a single all-purpose recovery clock.

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02

A better laboratory measure does not answer every reproductive question

Sperm concentration describes sperm per unit of semen; total count also depends on semen volume. Motility and morphology describe other features. None is itself the time a couple takes to conceive, and conception is not the same endpoint as a live birth. These distinctions matter even when a headline uses the broad word ‘fertility.’

ASRM's 2024 committee opinion describes evidence linking smoking to reduced female fecundity and poorer assisted-reproduction outcomes, while distinguishing semen findings from less conclusive evidence about male fertility. Comparisons of smokers with nonsmokers during fertility treatment do not directly measure what happens after a smoking-cessation intervention. Nor can a male semen follow-up determine recovery of ovarian reserve.

For example, the statements ‘mean sperm concentration increased in this group’ and ‘this couple will conceive sooner’ answer different questions. The first may be supported by a semen study; the second needs couple-level outcomes and an appropriate clinical context. It is reasonable to value the measured improvement without assigning it a personal success percentage or assuming that every previous effect of smoking has been reversed.

[1][2][3]

03

Use the evidence without postponing fertility care

If you have a fertility concern or are already under care, discuss the smoking change and the next steps with a qualified clinician. Do not turn a research follow-up date into a reason to cancel an appointment or wait for a ‘complete reset.’ Fertility difficulties can involve either partner and causes other than smoking; assessment timing depends on the clinical circumstances, not a universal quitting countdown.

In England, a GP can be an entry point for fertility concerns, and NHS local stop-smoking support is a separate route for help with quitting. Support with cessation cannot interpret a semen result, select fertility treatment or certify that conception will follow. This page does not provide pregnancy-specific care, treatment choices, supplement recommendations or instructions for collecting or interpreting personal samples.

[1][4][5]

04

What to keep in mind

• Direct cessation follow-up can show semen changes without proving conception or live birth.
• Three and six months are study visits, not personal recovery deadlines.
• Quitting support and fertility assessment can proceed together.