Smoking, alcohol and recreational drugs can affect fertility and may expose a pregnancy before you even know you are pregnant. Learn why changing these habits before conception matters for both partners.
Educational only — not medical advice. If you have urgent symptoms, seek medical care.
When preparing for pregnancy, people often focus on:
“When am I ovulating?”
But another question is equally important:
“What am I exposing my body to while I am trying?”
Smoking, alcohol and recreational drugs can affect reproductive health.
And once you start trying, there is another issue:
You may be pregnant for days or weeks before you know it.
That makes the period before the positive pregnancy test important too.
If you are preparing for pregnancy:
stop smoking
avoid second-hand smoke where possible
avoid recreational drugs
avoid alcohol while trying to conceive
tell your healthcare professional if stopping is difficult
Your partner should also think about these exposures because sperm health matters too.
Pregnancy does not begin when the pregnancy test becomes positive.
By then:
fertilization may have happened weeks earlier
implantation has occurred
early embryonic development has started
So:
“I'll stop when I find out I'm pregnant”
can mean exposure has already happened during early pregnancy.
Preparing before conception avoids this uncertainty.
Yes.
Smoking is associated with reduced fertility.
Tobacco smoke contains many chemicals that can affect reproductive health.
Smoking has been associated with:
taking longer to conceive
increased risk of infertility
reproductive ageing
increased risk of ectopic pregnancy
miscarriage
pregnancy complications
The exact risk varies with factors such as how much and how long someone has smoked.
Smoking is associated with adverse effects on ovarian function and reproductive ageing.
Women who smoke may experience menopause earlier on average than women who do not.
This is another reason smoking matters even before pregnancy begins.
Yes.
Smoking can affect semen quality.
It has been associated with changes in:
sperm concentration
movement
shape
sperm DNA
Male fertility is part of the pregnancy equation.
So stopping smoking should not be treated as something only the woman needs to do.
Second-hand smoke is also an unnecessary exposure.
If your partner smokes, ask him not to smoke:
around you
inside your home
inside the car
Ideally, pregnancy preparation can become an opportunity for him to stop as well.
Shisha or water-pipe smoking is not a safe alternative to cigarettes.
The smoke can expose users to:
nicotine
carbon monoxide
toxic chemicals
particulate matter
The water does not make tobacco smoke harmless.
If you are preparing for pregnancy, do not treat shisha as a safe substitute for cigarettes.
Vaping should not be considered harmless when preparing for pregnancy.
Many vaping products contain nicotine.
Nicotine exposure is not recommended during pregnancy, and vaping aerosols can contain other substances.
If you are using vaping to stop smoking, discuss an evidence-based cessation plan with a healthcare professional rather than assuming continued vaping is risk-free.
Heavy alcohol consumption can negatively affect reproductive health in both women and men.
For women, high alcohol intake may interfere with reproductive function.
For men, heavy drinking may affect:
testosterone
sexual function
sperm production
semen quality
The relationship between lower amounts of alcohol and fertility is less straightforward.
But once pregnancy is possible, there is another important consideration.
No safe amount of alcohol during pregnancy has been established.
Alcohol crosses the placenta and can affect fetal development.
For that reason, avoiding alcohol is the safest approach during pregnancy.
If you are actively trying to conceive, avoiding alcohol is the safest approach because you may become pregnant before you realize it.
This removes the question:
“Was I already pregnant when I drank?”
Do not panic.
Many people drink alcohol before discovering an unexpected pregnancy.
Stop drinking once you know and discuss concerns with your healthcare professional.
An exposure does not automatically mean the baby has been harmed.
The important step is to avoid further alcohol exposure.
You may hear:
“One glass doesn't matter.”
Because no safe amount of alcohol in pregnancy has been established, the safest recommendation is to avoid alcohol.
This applies regardless of whether the alcohol is:
wine
beer
spirits
cocktails
locally produced alcoholic beverages
Alcohol is alcohol.
Cannabis may affect reproductive function in both women and men.
Research continues to develop, but cannabis use is not recommended when preparing for pregnancy or during pregnancy.
Potential concerns include effects on:
ovulation
hormones
sperm
fetal development
Avoiding it while trying to conceive is the safer approach.
If you use cannabis for:
sleep
anxiety
pain
another symptom
discuss the underlying problem with a healthcare professional.
There may be better-studied treatment options when preparing for pregnancy.
Stimulant drugs can cause serious health risks and should be avoided when preparing for pregnancy and during pregnancy.
They may affect:
cardiovascular health
fertility
placental function
fetal growth
pregnancy outcomes
If you use these substances regularly, seek professional help.
Opioids require particular care.
If you are dependent on opioids, do not abruptly stop on your own simply because you want to become pregnant.
Withdrawal and relapse can create serious risks.
Medical treatment can help you plan pregnancy more safely.
A medicine being available by prescription does not make recreational use safe.
This includes misuse of:
opioid pain medicines
sedatives
stimulants
other psychoactive medicines
Tell your healthcare professional what you actually use so they can advise you safely.
Not every substance people use is labelled a “drug.”
Some herbal mixtures can contain powerful biologically active ingredients.
Products may be marketed as:
fertility bitters
womb cleansers
aphrodisiacs
menstrual regulators
ovulation boosters
blood tonics
Natural does not automatically mean safe.
If you regularly take herbal preparations, include them when reviewing substances before pregnancy.
Caffeine is different from smoking, alcohol and recreational drugs.
You do not necessarily need to eliminate caffeine completely when trying to conceive.
But very high intake is not advisable.
Once pregnant, many guidelines recommend limiting caffeine intake to around 200 mg per day.
Caffeine can come from:
coffee
tea
cola
energy drinks
chocolate
some medicines
Remember that serving sizes and caffeine amounts vary.
Energy drinks can contain substantial caffeine and other stimulants.
They may make it harder to know how much caffeine you are consuming.
When preparing for pregnancy, reducing or avoiding high-caffeine energy drinks is sensible.
Ideally, pregnancy preparation should involve both partners.
For male reproductive health, consider:
stopping smoking
avoiding recreational drugs
avoiding anabolic steroids
limiting or avoiding heavy alcohol use
maintaining general health
Sperm take time to develop.
Healthy changes made before conception can therefore be worthwhile.
This is particularly important for men trying to conceive.
Anabolic steroids and externally supplied testosterone can suppress the hormonal signals needed for sperm production.
Some men using these products may develop very low sperm counts or even no sperm in the semen.
If your partner uses testosterone or anabolic steroids and you are trying for a baby, he should discuss this with a qualified healthcare professional.
Dependence is a health issue.
If you find yourself saying:
“I know I should stop, but I can't,”
seek help.
Support may include:
counselling
behavioural treatment
medication where appropriate
specialist addiction services
smoking-cessation support
You do not need to solve dependence through willpower alone.
No.
Your clinician needs accurate information to give you appropriate advice.
For example, saying:
“I don't drink”
when you regularly drink heavily prevents the clinician from properly assessing:
withdrawal risk
medication interactions
pregnancy risks
support needs
Good healthcare requires honest information.
Sometimes.
If there is heavy substance use, uncontrolled dependence or a related medical problem, it may be safer to stabilize your health before trying to conceive.
This does not mean:
“You can never have a baby.”
It means:
“Let's improve the conditions before pregnancy begins.”
A healthcare professional can help create a realistic plan.
For example:
cigarettes → shisha
is not a safe pregnancy strategy.
Neither is:
cigarettes → uncontrolled vaping
or:
alcohol → unregulated herbal mixtures.
If you need help changing a habit, use an evidence-based approach.
Ask yourself:
Do I smoke cigarettes?
Do I use shisha?
Do I vape or use nicotine?
Do I drink alcohol?
Do I use cannabis?
Do I use recreational drugs?
Do I take herbal or traditional preparations?
Do I misuse prescription medicines?
Does my partner use any of these?
If the answer is yes, pregnancy planning is a good opportunity to review it.
Imagine this conversation:
“I am trying to stop drinking because we want a baby.”
Your partner responds:
“Good luck.”
That places the entire burden on you.
A better approach may be:
“We are preparing for a baby, so let's both look at the things we can change.”
That might mean:
stopping smoking together
reducing alcohol in the home
eating better
exercising together
attending appointments together
Pregnancy occurs in one person's body, but preparing for it can still be a shared responsibility.
Your preparation for pregnancy should begin before conception, not after the pregnancy test turns positive.
If you are trying for a baby:
Stop smoking.
Avoid recreational drugs.
Avoid alcohol.
Be cautious with unregulated herbal products.
Keep caffeine moderate.
And involve your partner.
These changes do not guarantee pregnancy.
But they can remove avoidable risks and help create a healthier environment for conception and early development.
And if stopping alcohol, nicotine or another substance is difficult:
seek professional support rather than trying to hide or manage dependence alone.
PREP-006: What Should I Do Before I Start Trying for a Baby?
PREP-007: Why Should I Have a Pre-Pregnancy Health Check?
PREP-008: Which Health Conditions Should Be Controlled Before Pregnancy?
PREP-009: Are My Medicines Safe If I Am Trying to Get Pregnant?
PREP-013: What Should I Eat When Preparing for Pregnancy?
PREP-014: Does My Weight Affect My Chances of Getting Pregnant?
PREP-025: Fertility Is Not Just a Woman's Issue: When Should My Partner Be Checked?