Smoking During Pregnancy: Risks, Effects on Baby and How to Quit Safely

Is It Safe to Smoke During Pregnancy?

No. There is no established safe amount of cigarette smoking during pregnancy. Cigarette smoke exposes the pregnant person and developing baby to nicotine, carbon monoxide, and other chemicals. These substances can interfere with oxygen delivery and normal fetal development. Smoking can also affect the placenta and increase the risk of several pregnancy complications.

This does not mean that smoking before knowing about the pregnancy guarantees a problem. Many factors influence pregnancy outcomes. A pregnant woman can take a step to quit as soon as possible and discuss tobacco use honestly with the counselling team.

How Does Smoking During Pregnancy Affect the Baby?

The developing baby depends on the placenta for oxygen and nutrients. Cigarette smoke can interfere with this environment, while nicotine can affect developing organs, including the brain and lungs. 

The effects of tobacco exposure on the baby can include:

• Restricted fetal growth and lower birth weight
• Increased risk of premature birth
• Effects on developing lungs and brain
• Certain birth defects, including some cleft lip and palate defects
• Increased risk of stillbirth and other serious pregnancy outcomes
• Greater risk of sudden infant death syndrome after birth when smoke exposure continues

Note: The level of risk can vary depending on factors such as the amount and duration of smoking and other aspects of pregnancy health.

Risks of Smoking During Pregnancy

The risks of smoking during pregnancy extend beyond the baby's growth. Smoking can increase the likelihood of pregnancy complications, including problems involving the placenta, premature rupture of membranes, and preterm delivery. It has also been associated with ectopic pregnancy and other serious reproductive health outcomes.

Some complications may not cause obvious symptoms until later in pregnancy. That is one reason regular prenatal care is particularly important when smoking has been part of the pregnancy.

How Does Nicotine Affect Pregnancy?

Nicotine is addictive, which can make stopping difficult even when there is a strong desire to quit. During pregnancy, nicotine can cross the placenta and reach the developing baby.

Research indicates that nicotine can affect fetal brain and lung development. E-cigarettes are also not considered safe during pregnancy when they contain nicotine. The concern is therefore not limited to cigarette smoke itself. Nicotine and pregnancy health risks also need to be considered when looking at vaping and other nicotine-containing products.

Effects of Maternal Tobacco-Smoke Exposure on Fetal Growth

Smoking can affect how the baby grows during pregnancy. Fetal growth restriction and low birth weight are some of the outcomes associated with maternal smoking. 

Smoking cessation can reduce these effects. Stopping earlier in pregnancy offers greater protection, but stopping later can still be beneficial. There is no point in pregnancy at which quitting suddenly becomes pointless. 

Routine prenatal care monitors growth through clinical assessment and, when needed, ultrasound or other tests. Discuss any concerns about fetal growth with the obstetric care team. 

Does Smoking Affect Fertility and Pregnancy?

Smoking can affect reproductive health before pregnancy as well as during pregnancy. It affects both female and male fertility. 

Effects on Female Fertility

Smoking can make it harder to become pregnant and is associated with reduced fertility. Tobacco exposure can affect reproductive function and may also contribute to earlier loss of reproductive potential. Stopping smoking before trying to conceive can therefore be beneficial even before pregnancy begins.

Effects on Male Fertility and Secondhand Smoke

Smoking can affect sperm and has been associated with problems that may make conception more difficult. This means tobacco exposure is not solely a female fertility concern. Secondhand smoke also deserves attention. A partner or family member who smokes around a pregnant person can contribute to tobacco exposure even when the pregnant person does not smoke directly. 

How Much Smoking Is Harmful During Pregnancy?

How Much Smoking Is Harmful During Pregnancy?

There is no recommended number of cigarettes that can be considered safe during pregnancy. 

It may be tempting to think that cutting down to one or two cigarettes makes smoking harmless. Reducing cigarette use can be a step toward quitting, particularly when it is part of a planned approach, but it should not be treated as a safe level of smoking during pregnancy. The goal is complete cessation. At the same time, someone who has not managed to stop yet should not be discouraged from trying again. Support from a partner, family, or peers can make the process more manageable.

Is Secondhand Smoke Harmful During Pregnancy?

Yes. Secondhand smoke during pregnancy is associated with lower birth weight and may increase the risk of premature delivery. 

After birth, continued exposure can also increase risks such as sudden infant death syndrome, respiratory infections, ear infections, and reduced lung function. Practical steps can reduce exposure: 

• Keep the home and car completely smoke-free.
• Ask household members to smoke outside, away from doors and windows.
• Avoid enclosed areas where people are smoking.
• Encourage family members who smoke to seek help with quitting.
• Wash hands and change smoke-exposed clothing before close contact with the baby when possible.

Note: Simply opening a window or smoking in another room does not remove the exposure completely. 

How to Quit Smoking Safely During Pregnancy?

Quitting can be difficult because smoking is often connected to ordinary parts of the day. Morning tea, after meals, work breaks, stressful conversations, social gatherings, or simply stepping outside can all become smoking cues. 

Opting for a gentle, practical approach can make these moments easier to manage. Here are some ways that can help one who wants to quit smoking during pregnancy: 

Start by Noticing the Routine 

Instead of focusing only on the number of cigarettes, identify when smoking usually happens. Knowing the strongest triggers makes it easier to plan around them. 

Change the Usual Smoking Cues 

If a cigarette usually follows breakfast, changing the routine for a while may help. Sitting somewhere different, brushing your teeth, having water, or moving directly into another activity can interrupt the familiar sequence. 

Make Cigarettes Harder to Reach 

Remove cigarettes, lighters, and ashtrays from handbags, bedside tables, balconies, cars, and other regular places. A little extra effort between a craving and a cigarette can create useful time to reconsider the urge. 

Have a Simple Craving Plan 

Cravings often rise and fall rather than staying at the same intensity. A few minutes of slow breathing, drinking water, taking a short walk, talking to someone supportive, or switching attention to another activity may help the craving pass. 

Ask for Practical Support 

A partner or family member can help by keeping the home smoke-free, avoiding offering cigarettes, and staying nearby during difficult moments. 

Do Not Treat a Slip as Failure 

One cigarette does not mean the quitting attempt has been ruined. It is more helpful to look at what triggered the slip and return to the quit plan than to give up completely. 

Healthcare professionals can also provide counselling and help create an individualised quitting plan. Behavioural support is an important part of tobacco cessation during pregnancy.

What Is the Best Way to Quit Vaping While Pregnant?

Vaping during pregnancy should not be considered a safe alternative to smoking. Nicotine-containing e-cigarettes can expose the developing baby to nicotine, and some ingredients in vaping aerosols may also be harmful. 

For someone who vapes regularly, quitting can involve more than nicotine cravings. The device itself may become part of a daily routine, such as reaching for it while watching television, working, driving, scrolling on the phone, or dealing with stress. 

A practical approach may include: 

• Keeping the vaping device and supplies out of immediate reach.
• Identifying the times when vaping happens automatically.
• Replacing those routines with another activity, such as drinking water, taking a short walk, or practising slow breathing.
• Avoiding situations where vaping is especially tempting during the early quitting period.
• Letting close family or friends know that vaping is being stopped so they can avoid offering it.
• Discussing persistent cravings or withdrawal symptoms with the prenatal healthcare team.

You don't need to manage the process alone. Counselling and other professional support can help with nicotine dependence and withdrawal. 

Tobacco and Nicotine Cessation During Pregnancy

Quitting tobacco during pregnancy is best approached with support rather than guilt. Healthcare professionals can help assess tobacco use, discuss cravings and withdrawal, and develop a plan suited to the pregnancy. 

Behavioural Support and Counselling

Counselling may be provided individually, in a group, by telephone, or through digital support. Even brief professional advice can help encourage quitting. Support may focus on: 

• Identifying smoking triggers
• Preparing for cravings
• Changing daily routines
• Managing stressful situations
• Preventing relapse
• Creating a smoke-free home environment

Nicotine Replacement and Other Medicines

Some pregnant people may need additional help managing nicotine dependence. Nicotine replacement or other cessation medicines may sometimes be considered, but the decision should be individualised. 

A healthcare professional can weigh the potential benefits and risks based on the pregnancy, smoking pattern, previous quitting attempts, and other health factors. Do not start these products on your own during pregnancy. 

What Happens After You Stop Smoking During Pregnancy?

After you stop smoking, your body begins to respond, and the benefits continue over time. During pregnancy, stopping can reduce the effects of smoking on fetal growth and may lower the risk of some adverse outcomes. 

There may also be everyday benefits, such as less coughing and easier breathing over time. Most importantly, stopping removes an ongoing source of tobacco smoke and nicotine exposure. 

Quitting early provides the greatest benefit, but stopping later in pregnancy still matters. It is never necessary to think that quitting is “too late.” 

When Should You Seek Medical Help?

Medical support is especially important when quitting feels difficult or withdrawal symptoms are making daily life hard. A prenatal healthcare professional should be contacted when: 

• Smoking continues despite repeated attempts to stop.
• Cravings feel difficult to manage.
• There is uncertainty about using nicotine-related cessation products.
• Vaping or other tobacco products are being used.
• There has been significant secondhand smoke exposure at home.
• There are concerns about pregnancy symptoms or the baby's growth or movements.

Assess any urgent pregnancy symptoms promptly, following the advice already provided by the maternity care team.

Conclusion

Smoking and pregnancy can create health risks for both the pregnant person and developing baby, but a pregnancy that has included smoking is not a reason to lose hope. 

Quitting before pregnancy offers the greatest protection, but stopping at any stage can still help. Small changes in daily routines, family support, counselling, and guidance from the healthcare team can make quitting more achievable. The aim is not to create fear or guilt. It is to reduce tobacco exposure and give both mother and baby a healthier environment for the rest of the pregnancy.