Alcohol, nicotine, and cannabis when trying to conceive, during pregnancy, and while breastfeeding

Three stages, three different questions

You may be a sperm donor hoping to improve your results. You may have a positive pregnancy test and be thinking about last weekend. Or you may be breastfeeding and wondering what could still reach your milk after substance use. These situations are connected, but one rule cannot answer all of them.

Before pregnancy

The concerns are fertility, sperm, hormones, and sexual function, as well as a pregnancy that may already have begun. Planning also needs to include the person hoping to become pregnant and your shared environment.

During pregnancy

Certain substances can reach the baby through the placenta. The pregnant person's health, the placenta's ability to supply the baby, and additional exposure to smoke also matter.

While breastfeeding

Substances in breast milk, smoke in the surroundings, and safe care of the baby are relevant. How quickly a substance clears and which feeding arrangement makes sense depend on the substance involved.

A statement about a future father's alcohol use therefore does not mean alcohol is safe during pregnancy. Conversely, one evening before conception cannot reliably predict a child's health.

What substance use can tell us about sperm and fertility

Sperm develop and mature over weeks. A semen analysis therefore does not simply show whether yesterday was healthy. Fever, the time without ejaculation before collection, an incomplete sample, and differences between tests can affect the results. Sleep, illnesses, and your longer-term circumstances also belong in the conversation.

Normal results are not a comprehensive health clearance, either. Reference values in the WHO laboratory manual do not draw a sharp line between fertile and infertile. If results are abnormal, clinical interpretation determines whether and when to repeat the test.

In studies of substance use, the outcome being measured matters: sperm count and motility are different outcomes from pregnancy or live birth. Other substances, illnesses, and accompanying factors can influence associations. Better semen results therefore do not guarantee pregnancy.

Alcohol in men: amount and drinking patterns go together

For male fertility, sustained heavy drinking is particularly relevant. It may be associated with changes in hormone regulation and testicular function. Results for small amounts or occasional drinking are less clear. Claiming that one beer destroys sperm would be just as inaccurate as declaring regular binge drinking harmless.

Alcohol can also make trying to conceive harder in everyday life, for example by affecting sleep, libido, erections, or reliability in keeping appointments. A review of lifestyle and male fertility discusses these hormonal, sexual, and reproductive connections.

For a medical appointment, your actual pattern is more useful than the word occasional: how many days, roughly how much, and whether you repeatedly become intoxicated. If you want to cut back substantially, you can plan a period of several weeks and observe changes in daily life and symptoms. If dependence is involved, this step needs medical support.

Smoking, nicotine, and fertility

Evidence links cigarette smoke with less favorable sperm counts, motility, and shape, as well as damage to sperm DNA. This does not mean every man who smokes is infertile. Smoking is, however, a useful place to start if you want to reduce avoidable exposures.

Tobacco smoke and nicotine should not be treated as the same thing. Cigarettes also deliver carbon monoxide and numerous combustion products. Evidence on vaping and nicotine pouches in human fertility is more limited; missing long-term data are not proof of safety. The ASRM committee opinion on tobacco, nicotine, and cannabis explains these distinctions.

Smoking also matters for the person hoping to become pregnant: in women, tobacco use is associated with reduced fertility and less favorable fertility treatment outcomes. Quitting is therefore a task for both people involved, including in private sperm donation. A smoke-free environment also reduces secondhand smoke exposure.

Cannabis before conception: evidence without simple cutoffs

Studies of cannabis and male fertility do not give a consistent picture. Some find changes in semen parameters or hormones; others find no clear association with time to pregnancy. THC content, frequency, method of use, and additional tobacco use vary widely. ASRM therefore assesses these associations more cautiously than the established risks of smoking.

If you are actively trying to conceive or have abnormal results, it makes sense to discuss cannabis openly and plan to stop. This reduces a possible exposure without promising that everything returns to normal after a set number of days without use. If cannabis is mainly used for sleep or anxiety, appropriate help for those symptoms belongs in the plan.

Anyone who could become pregnant should also avoid relying only on sperm studies. Recommendations to avoid cannabis for a possible early pregnancy already apply before a positive test.

Testosterone and anabolic steroids are a separate case

Testosterone taken from outside the body can suppress the hormonal signals the testes need to produce sperm. Sperm counts can fall substantially, or production can stop altogether. More muscle, a higher sex drive, or a high testosterone level therefore does not automatically mean better fertility.

The AUA/ASRM guideline on male infertility advises against testosterone monotherapy when current or future fertility is desired. This applies to medical prescriptions as well as steroid cycles and self-medication for fitness.

Discuss the product, dose, and duration with a urologist or andrologist. Recovery can take months and sometimes longer; this does not establish a fixed recovery deadline. Do not stop a prescribed treatment on your own or try to restart sperm production with hormone combinations you put together yourself.

Opioids, cocaine, and other substances

Drugs and sperm involve more than cannabis. Opioids can affect hormonal signaling and, in turn, libido and sexual function. Cocaine and other stimulants carry additional serious risks to cardiovascular and mental health. Research does not support a reliable ranking of doses that are safe for conception.

Prescribed pain treatment or treatment for opioid dependence is different from uncontrolled use. For opioid dependence during pregnancy, methadone or buprenorphine may be part of recommended treatment. Do not stop on your own: the CDC recommendations on opioid dependence during pregnancy emphasize the benefits of coordinated care. Newborns can develop withdrawal symptoms after opioid exposure, so the birth team should be informed early. This risk is not a reason to withhold necessary treatment.

Severe drowsiness, slow breathing, chest pain, seizures, or unconsciousness require emergency medical care. These are not symptoms to leave until your next fertility appointment.

Putting sugar and combined substance use in perspective

Sugar does not belong in the same risk category as tobacco smoke or anabolic steroids. A dessert does not suddenly make sperm unusable. A persistently high-calorie diet may affect weight and metabolism; that is a different question from a direct drug effect. Marked fatigue or loss of libido should therefore not be hastily attributed to sugar alone.

Combined substance use, on the other hand, is directly relevant. Alcohol, tobacco, and cannabis can overlap in daily life and make it harder to identify the reason for an abnormal result. Combining alcohol with opioids or sedatives such as benzodiazepines is particularly dangerous: their depressant effects can intensify and impair breathing. The FDA warning on opioids and sedating substances highlights this risk.

Include medications and why you take them, such as sleep problems or anxiety. Support for quitting and treatment of those symptoms go together. Supplements cannot offset the effects of substance use or replace that treatment; see the guide to supplements when trying to conceive.

Alcohol during pregnancy: no established safe limit

Alcohol can reach the embryo or fetus through the placenta. No safe amount, safe time, or safe type of alcoholic drink has been established for pregnancy. The recommendation is therefore to avoid alcohol throughout pregnancy. This also applies when you are trying to conceive and pregnancy is already possible. The CDC information on alcohol during pregnancy explains this recommendation.

A safe threshold cannot be tested experimentally in pregnant people. Research therefore relies mainly on observational studies, which do not always capture amounts and accompanying factors completely.

A large amount of alcohol in a short time produces high blood concentrations. This kind of binge drinking is especially concerning, but that does not make repeated smaller amounts automatically safe. Beer, wine, sparkling wine, and spirits differ in alcohol content, not in whether their alcohol can reach the baby.

Organs begin forming in the early weeks, while the brain continues developing throughout pregnancy. There is therefore no later stage when drinking becomes reliably harmless. At the same time, past exposure does not mean harm has definitely occurred.

FASD and other possible effects of alcohol

Fetal alcohol spectrum disorders, or FASD, describe a range of possible effects of alcohol exposure before birth. Growth, physical development, learning, memory, attention, planning, and impulse control may be affected. Difficulties with behavior and emotional regulation sometimes become apparent only when everyday demands increase.

Physical features can include a smaller head circumference or growth problems. Some affected people have characteristic facial features, such as short eye openings, a smooth groove between the nose and upper lip, and a thin upper lip. Their absence does not rule out alcohol-related developmental problems.

FAS and pFAS

Fetal alcohol syndrome and partial fetal alcohol syndrome are diagnostic terms within the spectrum.

ARND and ARBD

These terms describe alcohol-related neurodevelopmental disorders and alcohol-related birth defects, respectively. The diagnostic categories used differ between guidelines.

The CDC overview of FASD explains the terms; for diagnosis in Germany, the AWMF guideline on FASD in children and adolescents is relevant. Diagnosis requires experienced professionals and cannot be inferred from an amount consumed or a single physical feature.

Alcohol use during pregnancy is also associated with miscarriage, preterm birth, and other adverse pregnancy outcomes. A reassuring ultrasound is useful, but cannot exclude every later effect on learning and development. Likewise, an adverse outcome does not automatically mean that past drinking was the cause.

Substance use before a positive test: what helps now

Many pregnancies are not recognized for several weeks. If you drank alcohol, smoked, or used cannabis before then, the first step is to avoid further exposure and discuss the situation during prenatal care. A single past exposure is not proof of permanent harm.

Record the timing, approximate amounts, repeated use or binge drinking, and any other substances involved as honestly as you can. You do not need a perfect reconstruction down to the milliliter. The information should help with counseling, rather than become an endless search for a retrospective guarantee.

A clear question for the appointment is which checks and support are useful now. If alcohol dependence or a history of severe withdrawal may be involved, arrange medical help that same day for safe withdrawal. This specific situation should not be confused with advice to simply keep smoking cigarettes.

Smoking during pregnancy and after birth

Smoking involves several exposures at once. Carbon monoxide reduces oxygen transport in the blood; nicotine and other smoke components affect the pregnant person's body and the child's development. Well-established risks include growth problems, low birth weight, and preterm birth. Placental complications are also among the risks.

Smoke remains relevant after birth: secondhand smoke increases infants' risks of sudden infant death syndrome, lower respiratory illnesses, and middle ear problems, among others. The CDC overview of smoking and maternal and infant health summarizes these connections.

Ideally, quit smoking before pregnancy. Quitting later is still worthwhile because it prevents further exposure. One cigarette or a relapse does not erase the value of your earlier smoke-free period. What matters is returning to being smoke-free and addressing the trigger.

Vapes, hookah, snus, and nicotine pouches

No combustion does not automatically mean no risk. At the same time, describing every product as equally harmful would be inaccurate. Decisions need to consider smoke components, nicotine, additives, and the available evidence separately.

E-cigarettes and vapes

They avoid some of the combustion products in cigarettes, but can deliver nicotine and other substances in the aerosol. They are not a proven safe alternative during pregnancy. Nicotine-free e-liquids are not reliably tested pregnancy products either.

Hookah

Water does not reliably filter out harmful exposure. Smoke and carbon monoxide remain relevant, and long sessions can cause substantial exposure.

Snus and nicotine pouches

Snus contains tobacco; nicotine pouches can be tobacco-free. Both can deliver nicotine. Being smoke-free therefore does not make them a safe pregnancy option or an equivalent substitute for a medically planned quitting program.

The CDC information on the health effects of vaping explains the risks and evidence gaps. If you have already switched to another product, discuss a workable next step. The answer is not to return to cigarettes. The goal is freedom from smoke and, if possible, nicotine, with support you can actually use.

Secondhand smoke: keep homes and cars consistently smoke-free

Even if you do not smoke yourself, regular smoke exposure around you matters. Risks from secondhand tobacco smoke during pregnancy and infancy are established. Cannabis smoke is not a suitable environment for pregnant people or babies either, and combining it with tobacco brings both exposures together.

An open window, another corner of the room, or brief airing does not turn a smoky indoor space into a reliably protected area. Cars are particularly confined. The practical rule is therefore no smoking in the home or car, even when the baby is not there at the time.

Partners, family, and visitors can support this rule without negotiating exceptions every day. Kindergesundheit-Info's guidance on secondhand smoke offers further practical advice.

Nicotine replacement and medications for quitting

Counseling and everyday support are the foundation of quitting smoking during pregnancy. If these are not enough, medically supervised nicotine replacement, such as gum or patches, may be an option. It avoids cigarette combustion products, but needs appropriate selection and use. The IQWiG information on nicotine replacement therapy explains this balance.

NICE NG209 also recommends considering nicotine replacement alongside behavioral support. Your clinician needs to assess individually which products are suitable during pregnancy or breastfeeding; recommendations for nonpregnant adults cannot simply be transferred. This also applies to prescription medications for quitting.

Smoking less can be an intermediate step, but is not the same as being smoke-free. Exposure to harmful substances also does not necessarily fall in proportion to the cigarette count if you inhale harder or more deeply. A relapse is therefore a reason to revisit support and triggers.

Cannabis during pregnancy: what studies show

THC, the main intoxicating component of cannabis, can cross the placenta. There is no established safe dose for pregnancy. Descriptions such as plant-based or only on weekends therefore do not provide reassurance about safety.

A 2025 meta-analysis published in JAMA Pediatrics found adverse associations even after accounting for important confounders such as tobacco use. The adjusted statistical comparisons, called odds ratios, were 1.75 for low birth weight, 1.52 for preterm birth, and 1.57 for being small for gestational age. These are not percentages of affected children or personal predictions.

An evidence overview by Munn and colleagues including 89 studies and reviews also describes adverse associations with several growth and newborn outcomes, including intensive care. Evidence about later development, learning, behavior, and mental health is less consistent in some areas.

The largely observational studies do not prove that every difference found was caused by cannabis. Amount, timing, assessment through questionnaires or tests, and accompanying tobacco use affect what can be concluded. Nor does a single study without concerning findings answer every question. Professional organizations therefore advise avoiding cannabis during pregnancy and breastfeeding.

Cannabis products: flower, hashish, vapes, edibles, and CBD

Cannabis covers very different products. Alongside frequency, the conversation therefore needs to include THC content, route of use, possible additives, and mixing with tobacco. A medical-looking label says nothing by itself about suitability for pregnancy or breastfeeding.

Flower and hashish

Their forms and active ingredient concentrations differ, but both can deliver THC. Smoking adds combustion exposure, and mixing with tobacco adds its risks too.

Vapes, dabbing, and concentrates

Less conventional combustion does not eliminate THC exposure. Concentrates can contain large amounts of active ingredients; additives and the actual composition introduce further uncertainty.

Edibles, drinks, and capsules

After eating or drinking cannabis, effects may be delayed and last longer. This makes it easier to take more before the first dose has fully taken effect. Unexpectedly strong effects can contribute to anxiety, a racing heart, and accidents. The CDC information on cannabis describes these acute risks. Here, too, smoke-free does not mean risk-free.

Oils, drops, and CBD

CBD does not cause the same high as THC, but has not been studied sufficiently to establish safety during pregnancy or breastfeeding. Nonprescription products may also contain unexpected THC or contaminants.

The FDA information on cannabis and CBD explains why CBD is not a proven safe fallback either. Product form changes individual risks, but does not replace safety data.

Nausea, sleep problems, and medical cannabis

People using cannabis for nausea, pain, anxiety, or insomnia need a solution for those symptoms. Subjective short-term relief, however, does not establish that the treatment is safe or appropriate during pregnancy. The 2025 ACOG recommendation advises better-studied alternatives.

This applies to prescribed medical cannabis too. Discuss plans for pregnancy or an existing pregnancy early with both the prescriber and your pregnancy care clinician so the underlying condition can continue to be treated. A prescription is not a general guarantee of safety during pregnancy and breastfeeding.

If you can barely keep fluids down, are losing weight, pass very little urine, or have dizziness or faintness, you need prompt medical assessment. Severe pregnancy nausea should not be treated by experimenting with edibles or vapes.

When cannabis itself causes vomiting: cannabinoid hyperemesis

Regular cannabis use can cause cannabinoid hyperemesis syndrome, or CHS: recurrent severe vomiting and abdominal pain that can be mistaken for pregnancy nausea. Some people experience temporary relief from hot showers or baths. A case series on CHS during pregnancy describes this pattern.

Hot water is neither a reliable self-test nor a treatment recommendation. Persistent vomiting requires assessment for dehydration and other causes. Stopping cannabis is central to managing CHS; continued use for the presumed nausea can keep the problem going. Improvement after stopping does not replace necessary acute care.

Breastfeeding: consider alcohol, nicotine, and THC separately

The questions change after birth. Alongside breast milk, a smoke-free environment and a reliably sober caregiver matter. Substance use does not automatically lead to the same breastfeeding decision for every substance.

Alcohol and breast milk

Avoiding alcohol is safest. Alcohol passes into breast milk; as blood alcohol falls, the alcohol level in milk falls too. Pumping and discarding milk does not speed clearance. You can pump for comfort or to maintain your supply if needed, but this does not allow you to resume breastfeeding sooner.

As a guide, the US Centers for Disease Control and Prevention (CDC) advises waiting at least two hours per standard drink. Its standard drink contains 14 grams of alcohol, roughly 150 milliliters of wine at 12% alcohol by volume; a large glass may contain considerably more. More alcohol needs more time, and actual clearance varies. Plan previously expressed milk or suitable infant formula if needed. Premature babies, sick babies, or repeated drinking require an individualized discussion. This timing does not apply to cannabis or other drugs.

Smoking, nicotine, and breastfeeding

Nicotine and other substances can reach the baby through milk; smoke adds environmental exposure. If quitting has not yet been possible, breastfeeding is not automatically ruled out for that reason alone. Practical support and less exposure matter: smoke outdoors, keep your home and car smoke-free, and wash your hands and change smoke-exposed clothing before contact with the baby. The CDC recommendations on tobacco and breastfeeding emphasize this distinction.

Cannabis, THC, and breastfeeding

THC is fat-soluble and can pass into breast milk. Clearance varies widely; a urine test measures neither the THC concentration in milk nor the safety of breastfeeding. A fixed waiting period or pumping once therefore cannot reliably establish safety. ACOG recommends avoiding cannabis, but does not automatically consider continued use a reason to stop breastfeeding. Discuss the product, frequency, last use, and your baby's feeding with your clinician.

Other drugs and prescribed treatment

During current nonprescribed use of opioids, stimulants such as cocaine, or sedating sleep medications, the Academy of Breastfeeding Medicine recommends temporarily avoiding breastfeeding. Arrange safe feeding for the baby and get advice on when breastfeeding can resume. Stable, medically supervised treatment for opioid dependence, such as methadone, needs a different assessment and can be compatible with breastfeeding. Medications, dose, other substance use, and the baby's condition all belong in this decision.

Sober care and preventing accidental ingestion

Someone who is intoxicated or very drowsy cannot safely care for a baby alone. Arrange for a sober adult. After alcohol, cannabis, or sedating substances, do not sleep with the baby in the same bed or on a sofa. A separate crib is also important if a caregiver smokes. The BIÖG guidance on safe sleep environments explains these risks.

Keep cannabis products, e-liquids, and medications locked away and out of children's sight and reach. Cannabis edibles in particular can be mistaken for candy; nicotine-containing e-liquids can also cause severe poisoning. For more on feeding decisions, see Breastfeeding or not breastfeeding.

Tests, private sperm donation, and medical assessment

A period without substance use replaces neither a semen analysis nor infection screening. Likewise, a home sperm test cannot confirm that a donation is medically safe. For private sperm donation, verifiable health information, appropriate tests, and clear agreements remain separate responsibilities.

A semen analysis and, if needed, further investigation make sense when pregnancy has not occurred, known risks are present, or the medical history raises concerns. The WHO infertility guideline describes a structured diagnostic approach. Abnormal results should not be hastily attributed to lifestyle alone.

Early urological or andrological assessment is sensible after anabolic steroid use, or if you have persistent erection problems, a marked loss of libido, or abnormal testicular findings. Sudden severe testicular pain, swelling, or pain with fever need urgent assessment. A new lump or repeated blood in semen should also be investigated. The guide to semen and sperm explains the basic terms.

A realistic plan for the next few weeks

For men planning conception, eight to twelve weeks can be a manageable period for changing habits and arranging follow-up. This is not a biological guarantee or a reason to postpone a necessary examination. During pregnancy, the priority is to avoid further exposure as soon as possible, with medical help if dependence is involved.

1. Record substance use, medications, and the situations in which you use them. Include vapes, nicotine pouches, cannabis oils, steroid cycles, and combined substance use.
2. Choose concrete next steps: help with quitting smoking, an assessment appointment, or treatment for sleep problems, anxiety, pain, or nausea.
3. Agree on smoke-free rules for your home and car and arrange support around you. Plan suitable drinks for celebrations and how to handle triggers for use.
4. Decide on replacement activities for recurring triggers, such as a coffee break, a car trip, or the evening after an argument.
5. Set a time to review what is working and what additional help you need. Include relapses in that review without abandoning the whole plan.

A booked counseling appointment or a plan for the next difficult situation helps more than resolving to do everything perfectly from now on.

Celebrations, alcohol-free drinks, and support from others

At gatherings, order a suitable drink right away or bring one with you. Ask trusted people not to top up your glass or suggest exceptions. A brief refusal is enough; you do not have to explain a pregnancy or your medical history publicly.

An alcohol-free label does not mean every product is entirely without alcohol. Check the specific labeling. If drinks resembling beer or wine trigger cravings, choose a different type of drink.

Partners, family, and friends can avoid pressuring you to use substances, take tasks off your hands, and support smoke-free rules. Blame or minimizing comments make open conversations harder. Support remains important after birth, when sleep loss and stress can encourage old habits again.

When help matters and where to find it

Seek support if you keep using despite your intentions, can no longer control amounts, use secretly, or need alcohol or cannabis to sleep or get through the day. Severe restlessness, panic, depressive symptoms, or repeated vomiting also warrant medical assessment.

If alcohol dependence is possible, unsupervised withdrawal is dangerous, especially after previous shaking, sweating, or seizures. The WHO recommendations on alcohol withdrawal emphasize supervised treatment. Regularly taken benzodiazepines should also not be stopped abruptly because severe withdrawal symptoms are possible. For seizures, breathing problems, confusion, or impaired consciousness, call 112 in Germany.

A family doctor, pregnancy care clinician, midwife, or addiction counseling service can be a first point of contact. In Germany, the BIÖG addiction and drugs helpline offers initial guidance; rauchfrei-info provides support for quitting smoking during pregnancy.

Four details help in the conversation: what you use, how often, why you use it, and what happens when you pause. Also say whether you are pregnant, breastfeeding, or planning sperm donation or treatment. This can turn a general warning into a concrete treatment plan.

Legal status does not replace a health assessment. Germany's Consumer Cannabis Act has applied since April 1, 2024; the German Federal Ministry of Health information on the Cannabis Act explains the legal framework. Legal permission does not mean medical approval for use during pregnancy or breastfeeding.

Common myths that make decisions harder

A single use proves that everything has already been damaged.

Exposure is not definite proof of harm. An honest assessment, avoiding further exposure, and appropriate help are what matter.

A normal semen analysis makes any further use harmless.

It assesses specific semen parameters. It is neither a comprehensive health check nor a statement about the safety of a future pregnancy.

Plant-based, smoke-free, or prescribed automatically means safe.

These characteristics answer different questions. None replaces evidence about the specific use when trying to conceive, during pregnancy, or while breastfeeding.

A few cigarettes or use only on weekends is guaranteed harmless.

Less exposure can be progress, but it is not an established safe threshold. Amount, product, and situation still matter.

Testosterone increases masculinity and therefore sperm production too.

Testosterone supplied from outside the body can suppress that very production. Plans for children therefore need to be discussed early in treatment planning.

Pumping removes alcohol or THC from the body faster.

Pumping does not speed alcohol clearance or make THC elimination reliably predictable.

A relapse means quitting does not work anyway.

A relapse shows where the plan needs more support. The next step without smoking or substance use is still worthwhile.

Conclusion

Alcohol, nicotine, and cannabis need different answers at different stages. Starting to quit early, avoiding further exposure, and getting professional help for dependence are useful steps. Past use is not definite proof of harm; a normal test is not reassurance that continued use is safe. A concrete plan and appropriate support matter most.