Both partners matter. Quit 3 months before. Most effects reversible.

Yes nicotine affects fertility in both men and women through several mechanisms. The effects are dose related plus smaller than smoking but not zero. For women nicotine can affect ovulation, egg quality, fallopian tube function plus implantation. For men it can reduce sperm count, motility, morphology plus DNA integrity. NHS guidance for couples trying to conceive is to quit nicotine entirely for at least 3 months before conception attempts. Many effects are reversible after stopping. Here is the full picture plus how to access NHS fertility support. This article is general consumer information, not medical advice.

Female fertility effects

Nicotine affects multiple aspects of female reproductive function:

1. Ovulation. Nicotine can disrupt the hormonal signalling that triggers regular ovulation. Women using nicotine may experience irregular cycles, missed ovulation or shortened luteal phase. The effect is dose related plus typically smaller at lower nicotine strengths.

2. Egg quality. Published research suggests nicotine may affect egg quality through oxidative stress plus effects on the follicular environment. Egg quality directly affects fertilisation capacity plus embryo development.

3. Fallopian tube function. Nicotine affects the fine cilia that line the fallopian tubes plus help transport eggs toward the uterus. Impaired transport can reduce conception chances plus may contribute to ectopic pregnancy risk in smokers (vape-specific data on ectopic risk is limited).

4. Implantation. Successful pregnancy requires a fertilised egg to embed in the uterine lining. Nicotine can affect uterine blood flow plus the receptivity of the endometrium.

5. Menopause timing. Long-term nicotine use is associated with earlier menopause in smokers. Vape-specific data is still developing but may share this effect to a smaller degree.

Women trying to conceive who use nicotine typically have modestly lower pregnancy rates per cycle compared to non-users. For those considering fertility treatment these effects compound with any treatment-specific challenges.

Male fertility effects

Male fertility is also affected. Specific sperm parameters most affected by nicotine:

1. Sperm count. Nicotine is associated with reduced sperm concentration in published research. The effect is typically 10-20 per cent reduction in regular smokers. Vape-specific effect appears smaller.

2. Sperm motility. The percentage of sperm that swim well is reduced. Motility is critical for sperm reaching plus fertilising the egg.

3. Sperm morphology. The proportion of normally-shaped sperm is reduced. Abnormally-shaped sperm are less likely to fertilise successfully.

4. DNA integrity. Nicotine is associated with increased sperm DNA fragmentation. This can reduce fertilisation success plus is associated with early miscarriage in some research.

Combined effects on count, motility, morphology plus DNA integrity substantially reduce overall fertility potential. The good news: sperm production is a 2-3 month cycle so most nicotine-related sperm changes are reversible within one full cycle after stopping.

Vape vs smoking for fertility

Smoking is well-documented to affect fertility substantially. Vape effects appear to be in the same direction but smaller in magnitude based on current evidence:

• Smoking. Well-documented severe effects through nicotine plus combustion by-products including carbon monoxide effects on oxygen delivery plus heavy metals.
• Vaping. Nicotine-specific effects present. Combustion by-products are absent. Overall smaller effect on fertility than smoking.
• Quitting nicotine entirely. Cleanest option. Most effects reverse within weeks to months.

For couples who both smoke, switching to vape is a step up. Switching to NRT is another step up. Quitting entirely is cleanest.

NHS guidance for couples trying to conceive

The NHS position on nicotine for fertility is clear:

• Both partners aim to quit nicotine entirely. Male fertility matters as much as female.
• Quit at least 3 months before trying to conceive where possible. Covers one full sperm production cycle plus allows hormonal restoration.
• NHS Stop Smoking Services provide free structured support for couples. Higher success rates than going alone.
• GP appointment as first step. Pre-conception health checks identify other modifiable factors.
• Fertility clinic referral if difficulties persist after 12 months of trying (6 months if woman is over 36).

Fertility treatment and nicotine

If you are going through or considering fertility treatment, nicotine use matters significantly:

• IVF success rates are lower in nicotine users. Effects vary across studies but typically show reduced eggs retrieved, lower fertilisation, lower implantation plus higher miscarriage rates.
• Most UK fertility clinics advise both partners to quit nicotine entirely before starting treatment. Some clinics have policies requiring cessation.
• The 3-month pre-treatment window allows time for improved gamete quality.
• Ongoing cessation through treatment plus pregnancy matters for outcomes.

If you are preparing for IVF or other fertility treatment, prioritise cessation support through your GP or NHS Stop Smoking services. Many clinics integrate smoking cessation support into treatment pathways.

What to do now

• Book a GP appointment for pre-conception check-up if trying to conceive.
• Access NHS Stop Smoking Services for structured cessation support.
• Step down nicotine strength if immediate cessation is not possible.
• Both partners involved in cessation plans for best outcomes.
• Standard fertility health advice still applies: healthy weight, balanced diet, folic acid for women, moderate alcohol, regular exercise.
• 12-month referral threshold (6 months for women over 36) for fertility investigation if not conceiving.

If you are stepping down nicotine strength as part of pre-conception planning, our nicotine salts collection covers every UK compliant strength from 20mg down to 3mg. The goal remains complete cessation for best fertility outcomes.

For the wider view on vape, hormones plus reproductive health, our full health hub covers every major question UK readers ask.