Smoking is widely recognised as a major threat to overall health, increasing the risk of conditions such as heart disease, stroke, lung cancer and respiratory illnesses. However, its effects extend beyond these conditions, with research showing that smoking can also negatively affect reproductive health and reduce a person’s chances of having children.
Both men and women can experience fertility problems linked to smoking. Chemicals in tobacco smoke, including nicotine, carbon monoxide and other toxic substances, can interfere with hormone production, damage reproductive cells and affect the organs responsible for conception.
Although smoking does not mean that someone will inevitably become infertile, it can reduce fertility and increase the time it takes to conceive. The risks may also increase with prolonged exposure and heavier tobacco use.
Here are six ways smoking can damage fertility.
1. Smoking damages sperm quality in men
One of the major ways smoking affects male fertility is by reducing sperm quality.
Research has linked tobacco use to lower sperm concentration, reduced sperm movement (motility) and abnormalities in sperm shape. These factors can make it more difficult for sperm to travel through the female reproductive tract and successfully fertilise an egg.
Toxic chemicals in cigarette smoke can also increase oxidative stress, a process that damages cells and their genetic material.
This can affect sperm DNA, potentially compromising sperm function and reproductive outcomes. Men who smoke may therefore face a greater risk of fertility difficulties than non-smokers.
2. It reduces fertility in women
Smoking can interfere with several processes involved in female reproduction, including egg development, hormone regulation and the functioning of the ovaries.
Chemicals in tobacco smoke can damage ovarian tissue and affect the quality of eggs available for fertilisation. This may reduce a woman’s ability to conceive naturally.
Studies have also associated smoking with reduced fertility and a longer time to become pregnant.
The effects may be more pronounced among women who smoke heavily or have been exposed to tobacco smoke over an extended period.
3. Smoking accelerates the loss of eggs and causes early menopause
Women are born with a limited supply of eggs, and smoking may accelerate the rate at which this supply declines.
Toxic substances in cigarette smoke, including nicotine, cyanide and carbon monoxide, can damage ovarian tissue and reproductive cells, contributing to the loss of healthy eggs.
According to the American Society for Reproductive Medicine, women who smoke may experience menopause between one and four years earlier than non-smokers. Smoking has also been associated with lower levels of anti-Müllerian hormone (AMH), an indicator of ovarian reserve.
A reduced ovarian reserve can make conception more difficult, particularly as a woman gets older. Since eggs lost through this process cannot be regenerated, prolonged smoking may have lasting consequences for reproductive health.
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4. It increases the risk of ectopic pregnancy
Smoking can affect the functioning of the fallopian tubes, which transport eggs from the ovaries towards the uterus.
The toxic chemicals in tobacco smoke may interfere with the tiny hair-like structures called cilia that help move the fertilised egg through the fallopian tubes.
When this process is disrupted, a fertilised egg may become implanted outside the uterus, commonly in a fallopian tube. This condition is known as an ectopic pregnancy.
An ectopic pregnancy cannot develop into a normal birth and can become life-threatening if the fallopian tube ruptures and causes internal bleeding.
Research reviewed by the American Society for Reproductive Medicine has consistently associated cigarette smoking with an increased risk of ectopic pregnancy.
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5. Smoking increases the risk of miscarriage
Smoking can also affect the ability of a pregnancy to develop successfully after conception.
Chemicals in tobacco smoke can damage the genetic material in eggs and sperm, while substances such as nicotine and carbon monoxide can interfere with oxygen supply and normal development during early pregnancy.
These effects may increase the likelihood of pregnancy loss.
The American Society for Reproductive Medicine reports an association between tobacco use and an increased risk of spontaneous miscarriage, including pregnancies achieved through fertility treatment.
Importantly, the risks are not limited to women who smoke. Exposure to secondhand smoke may also have negative reproductive consequences.
Avoiding tobacco smoke before and during pregnancy is therefore an important step towards protecting reproductive health and supporting a healthy pregnancy.
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6. Smoking reduces the success of fertility treatment
For couples experiencing difficulties conceiving naturally, treatments such as in vitro fertilisation (IVF) and other assisted reproductive technologies can provide an opportunity to have children.
However, smoking may reduce the chances of success.
In women, smoking has been associated with fewer eggs being retrieved during IVF, reduced implantation rates and lower chances of achieving a successful pregnancy.
Male smoking may also affect treatment outcomes by compromising sperm quality and potentially damaging the DNA carried by sperm.
According to the American Society for Reproductive Medicine, smokers undergoing assisted reproductive treatment have lower live birth rates than non-smokers. Some studies also suggest that smokers may require more IVF attempts to achieve pregnancy.
Consequently, stopping smoking before undergoing fertility treatment can help improve reproductive health and potentially increase the chances of a successful outcome.
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Quitting smoking can improve reproductive health
Although smoking can have serious consequences for fertility, quitting is an important step towards protecting reproductive health in both men and women.
Couples planning to have children should consider avoiding cigarettes, tobacco products and exposure to secondhand smoke. Those who need help quitting can speak with a qualified healthcare professional about appropriate smoking cessation support.
It is also important to remember that smoking does not automatically mean a person will become infertile. Fertility depends on several factors, including age, general health and reproductive conditions.
Anyone experiencing difficulties conceiving should seek medical advice rather than assuming smoking is the only cause.
Ultimately, giving up smoking can help protect reproductive health, improve the chances of conception and support healthier pregnancies.
