You are here: Home > FAQ > Pregnancy: Does cannabis/THC do harm to the fetus if it is used during pregnancy?

Pregnancy: Does cannabis/THC do harm to the fetus if it is used during pregnancy?

Institute of Medicine

Among the studies that have investigated the relationship between prenatal marijuana exposure and birth outcome, the results have been inconsistent. Except for adolescent mothers, there is little evidence that gestation is shorter in mothers who smoke marijuana. Several studies of women who smoked marijuana regularly during pregnancy show that they tend to give birth to lower weight babies. (...)
For most of these studies, much of the harms associated with marijuana use are consistent with those associated with tobacco use, and smoking is a significant factor so the contribution of cannabinoids cannot be confirmed. However, Jamaican women who use marijuana rarely smoke it, but instead prepare it as tea. In a study of neonates born to Jamaican women who either did or did not ingest marijuana during pregnancy, there was no difference in neurobehavioral assessments made at 3 days after birth and at one month. (...)
Since 1978, the Ottawa Prenatal Prospective Study has been measuring the cognitive functions of children born to mothers who smoked marijuana during pregnancy. (...) The children in the different marijuana exposure groups showed no lasting differences in global measures of intelligence such as language development, reading scores, and visual or perceptual tests. Moderate cognitive deficits were detectable among these children when they were four days old and again at four years, but these deficits were no longer apparent at five years. Prenatal marijuana exposure was not, however, without lasting impact. By comparison, at both ages 5-6 and 9-12, children in the same study who were prenatally exposed to tobacco smoke scored significantly lower on tests of language skills and cognitive functioning.
Joy JE, Watson SJ, Benson JA, eds. Marijuana and medicine: Assessing the science base. Institute of Medicine. Washington DC: National Academy Press, 1999.

Free Online Events 2020

You can find all information here.

The IACM is holding a free webinar series and a free anniversary online meeting from October to December 2020

All webinars will be held in English with subtitles in German, French, Spanish, and Portuguese. All webinars will be available online until March 2021

The anniversary online meeting to celebrate the IACM's 20th anniversary and to honour the 90th birthday of Raphael Mechoulam will be a live session only on the 5th November 2020.

The speakers in the webinar series are Donald I. Abrams, Bonni Goldstein, Franjo Grotenhermen, Manuel Guzmán, Raphael Mechoulam, Kirsten Müller-Vahl, Roger Pertwee, Daniele Piomelli, and Ethan Russo.

You can find all information here.
 

IACM Conference 2021

The 12th IACM Conference on Cannabinoids in Medicine will be held in Basel, Switzerland, from 14 to 16 October 2021.

Members only

Regular members can sign up for the new member area of the IACM to access exclusive content.

You need to become a regular member of the IACM to access the new member area.

IACM on Twitter

Follow us on twitter @IACM_Bulletin where you can send us inquiries and receive updates on research studies and news articles.