So we already know that cannabis makes guys less fertile. (Of course, another study found the opposite.) Now, we have one more study suggesting that cannabis makes wimmen less likely to end up getting pregnant.

It looks like wimmen who take cannabis are less likely to get into this state. Photo:  Fabrizio Morroia

It looks like wimmen who take cannabis are less likely to get into this state. Photo: Fabrizio Morroia

The study in detail

This latest study, published in the journal Human Reproduction, covered over 1,200 wimmen attempting to conceive after previously suffering one or two miscarriages. 66% of wimmen who didn’t take cannabis got pregnant while 42% who did ended up up the stick. The reason for this difference is as yet unfathomed, but the researchers suspect it’s because dope increases wimmen’s levels of luteinising hormone, which helps regulate ovulation. Another possible cause seen in animal studies is that cannabis changes the lining of the uterus, so an embryo has less chance of implanting and establishing a pregnancy.

The researchers mostly hailed from the US National Institutes of Health (NIH), part of the Department of Health and Human Services and the leading federal agency for medical research. They examined data from a clinical trial investigating the effects of aspirin on 1,228 pregnant wimmen from Colorado, Noo Yawk, Pennsylvania and Utah from 2006 to 2011. Levels of cannabis use were determined by questionnaires and urine samples. Only 62 of the wimmen took cannabis, but they also took more alcohol, anti-depressants and opiods, which also make getting pregnant less likely; the researchers took account of this. Cannabis use by the wimmen’s partners went unexamined, although it could have had an effect. There was no difference in the miscarriage rate of cannabis users and non-users.

What was discovered

Dr Sunni Mumford, an investigator at the NIH who led the study, admitted that such a small number of the wimmen taking cannabis weakened the results. But her team was still confident of them: cannabis use reduces the chance of getting pregnant, particularly for wimmen who have already lost a pregnancy. The upshot was that cannabis-using wimmen were 41% less likely to conceive despite fucking more.

And it isn’t just one study, either

A study that appeared in the Medical Journal of Strylia in 2020 found that wimmen who took cannabis after 15 weeks of pregnancy were more likely to excrete babies that weighed less and had a shorter head circumference. A study in the Journal of the Endocrine Society in 2020 found that cow eggs exposed to tetrahydrocannabinol, the ingredient of cannabis that gets you high, were much less likely to result in pregnancy. Nevertheless, cannabis is increasingly taken to treat morning sickness.

So what?

The authors stated that, until more information is available, wimmen attempting to become pregnant should bear in mind that cannabis might lessen their chance of getting pregnant. Miriam Melis, an associate professor of pharmacology at the University of Cagliari, Italy, summed it up nicely: “Would you give a joint to a kid? I think you wouldn’t. So why would you need give it to a foetus?”

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