TL;DR: A new paper in Nature Communications looked at THC around eggs during IVF and saw a small dip in the share of embryos that look chromosomally “normal” in the lab. A local TV piece turned that into “weed causes infertility, miscarriages, and genetic defects.”
That’s not what the study showed. It didn’t track pregnancies or babies and used leftover immature eggs in dishes. Meanwhile, big human studies find no slower time-to-pregnancy and an IVF cohort found no worse IVF results. If you’re trying to conceive or are pregnant, mainstream guidance says to pause use, per the CDC and ACOG. The scary headlines go further than the data.
What the new paper actually did
Clinic records at one IVF center: They checked the fluid around eggs for THC leftovers. A small group tested positive. Those patients had a slightly lower rate of embryos that look chromosomally normal in the lab (60% vs 67%). That’s a lab checkpoint, not a pregnancy.
Dish experiments on leftover immature eggs: They put unused, not-fully-mature eggs in dishes with THC and watched. Some lab signals moved in a worrying direction (more “wonky” chromosome-sorting gear at a higher dose), but several results—like more eggs with the wrong number of chromosomes—were too small and noisy to be sure.
Bottom line: This shows a possible lab signal, not proof that cannabis users struggle to get pregnant or have more miscarriages.
Why the headlines overshot
The TV piece said “infertility, miscarriages, genetic defects.” The paper didn’t measure any of those. It measured proxies in a lab (how embryos look under a microscope). Proxies can be useful, but they don’t equal real-world outcomes.
The fine print (from the paper itself)
Tiny exposed group: Only a small slice of IVF patients tested THC-positive.
What …
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Author: High Times / High Times
