Cannabis
Cannabinoids
Evidence level : Probable LifestyleMechanism : Environmental / physical burden
🟡 Several human studies point the same way, with a plausible biological mechanism, but the evidence is not yet conclusive.
- Where it's found
- Occasional or regular recreational use, smoked or inhaled.
- Suspected mechanism
- The endocannabinoid system is involved in sperm maturation and ovulation; regular use is associated with lower sperm concentration.
- Suggested alternative
- Reduce frequency during the period of trying to conceive; the effect is partly reversible.
- Source
- EARTH studies; reviews on cannabis and reproductive function.
Map your everyday exposures in about ten minutes.
Take the questionnaireRelated factors
Including a factor does not mean it causes infertility: it is simply worth monitoring, depending on its level of evidence.
Content last updated: September 14, 2026