The ancient Mayans believed so strongly in life cycles that their sacred calendar, the Tzolk’in, is made of smaller cycles totaling 260 days. Why? Because it marks the completion of our first cycle in the womb, following nine moons of gestation.
The endocannabinoid system is in place and working well before and during pregnancy. Its components help regulate fertility and development through a complex web of cycling endocannabinoids, sex steroids, gonadotropins, and cannabinoid receptors on reproductive organs – and the developing fetus.
During gestation, the fetus forms the roots of every cell to set us up for long-term success. For survival, these early processes must go well. This means they need to be nutritionally-supported, adequately hydrated, and unaltered by outside toxins and mutagens.
Because cannabinoids can cross the placenta, and fetuses have cannabinoid receptors, there’s an open window for them to be introduced directly to the fetus. This means cannabinoids may pose short and long-term health effects for fetuses.
We know that alcohol, tobacco, smoking, and certain drug use during pregnancy cause fetal harm, but what about cannabis? Or CBD? What reasons do people have for using cannabis during pregnancy, and do the potential benefits outweigh the harms?
Historically, cannabis has been used for morning sickness and pregnancy-induced nausea and vomiting for thousands of years. Modern surveys estimate that as many as 22% or more of pregnant people still use cannabis, mostly in the critical first trimester, when morning sickness peaks. The rationales vary, but it’s important to understand why.
More and more pregnant people are also turning to CBD, presumably because of perceived less harm and non-inhalational route availability. A 2024 international study found that about one in five (20%) pregnant individuals in the US and Canada report CBD-only use for:
In general, about 70% of the pregnant population experiences some form of nausea and vomiting in pregnancy. The most extreme form of morning sickness is a condition called hyperemesis gravidarum (HG).
HG is necessary to treat because it can cause significant weight loss of over 15% of pre-pregnant weight, and cause other pregnancy complications. The symptoms can be severe enough to drive HG patients to suicidal ideation (26%) and fetal termination (5%). Despite aggressive medical management, HG can still be difficult to control.
In a 2022 survey of 550 HG patients, 14% reported using cannabis for their HG. The majority (71%) of those report effectively using cannabis or cannabis-based products (CBPs) because their prescriptions aren’t helping. Importantly, HG by itself puts fetal safety at 5 times more risk of smaller gestational size than cannabis use alone and is riskier than other substances and health conditions like high blood pressure, diabetes, preeclampsia, autoimmune, cocaine, amphetamines, and tobacco use.
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While the potential benefits for many pregnancy-related symptoms are there, they need to be weighed against the potential fetal harms on a relative, case-by-case basis.
By now, there’s a decent accumulation of preclinical and observational or cohort data that leans against recommending cannabis or CBD during pregnancy over concern for structural birth defects. The data suggest that plant-based cannabinoids introduced during pregnancy can alter normal development and are associated with neurodevelopmental effects that may persist into adulthood.
Given heavy research limitations, cannabis use during pregnancy may significantly increase the relative odds of negative fetal effects like:
Observational data like this is likely the best we can do with cannabis and pregnancy for now – and you may wonder why. That’s because it’s unethical to give probable teratogens to pregnant individuals in double-blind studies. So, we still won’t likely see such studies in spite of legalization efforts.
It’s not clear exactly how much greater these relative risks are because of these respectful limitations, but it may be dose-dependent. This is consistent with other dose-related cannabis side effects but is still up in the air for pregnancy. Pregnant people should be aware of these relatively heightened risks when deciding to consume cannabis for their symptoms, according to a 2024 large retrospective study on over 300,000 pregnant people:
We now have larger population data accumulated from over 100 studies on pregnancy and cannabis. The research is restricted to observation and self-reported surveys but gives us a better idea of how cannabis can negatively affect fetal development, despite the otherwise potential benefits for the pregnant individual. The data are limited by ethics and confounding substances, but overall, it doesn’t look good.
Without better clinical safety information at this point, healthcare providers generally recommend that all cannabinoids like THC and CBD be avoided during pregnancy, planning, and nursing out of concern for fetal safety. This is particularly true if the products are contaminated by pesticides, solvents, and other potentially teratogenic compounds.
That being said – and without downplaying the potential fetal risks – there are still thousands of pregnant people out there who successfully use cannabis during pregnancy to relieve symptoms, without better options, and still have perfectly normal birthing outcomes. Like any medical decision, the benefits need to be weighed against the harms and should be discussed with your provider on an individual basis.
What about after birth? The journey is just beginning, so follow along when we dive into the next chapter.
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