# Marijuana Smoking and Markers of Testicular Function Among Men from a Fertility Center > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/marijuana-reproductive-effects-testicular-function-men/ > **Published:** 2022-04-05T15:59:53-04:00 | **Last Modified / Clinically Audited:** 2026-09-28T11:16:41-04:00 > **Clinical Summary:** Explore marijuana reproductive effects on testicular function and sperm quality among men from a fertility center in this recent study analysis. --- Although marijuana and THC, its biologically active constituent, are most well-known and well-studied for their roles in and influence on the nervous system, evidence of their reproductive effects has also emerged from research done on lab mice. However, only very recently was the first study conducted to assess how smoking marijuana is associated with sperm and reproductive hormone quality in men. The study took place at the Massachusetts General Hospital Fertility Center, with the participation of 662 males from couples experiencing difficulties conceiving. The scientists found that within this group, men who had smoked marijuana, either prior to or at the time of the study, had an average sperm concentration of 62,7 million/mL. This was significantly higher than those who had never smoked marijuana, who had an average sperm concentration of 62,7 million/mL. A similar pattern was observed for total sperm count. Furthermore, the prevalence of sperm concentration and total sperm motility below WHO reference values among marijuana consumers was less than half that of marijuana non-users. Finally, there was no difference in serum testosterone level between men who had and had never smoked marijuana. Although these findings might not be perfectly representative and generalizable to all men, as the study was conducted on those who experienced challenges conceiving, to certain extent, they still contradicted the concern that marijuana poses deleterious effects on testicular function. [More access here](https://cedclinic.com/) [https://cedclinic.com/contact/](https://cedclinic.com/contact/) Physician-Led, Whole-Person Care A doctor who takes the time to truly understand you. Personal care that starts with listening and is guided by experience and ingenuity. Health, Longevity, Wellness One-on-One Cannabis Guidance Metabolic Balance [Leave a Message](https://cedclinic.com/contact/) [Metabolic Care](https://cedclinic.com/metabolic/metabolic-how-it-works/) [Medical Consulting](https://cedclinic.com/book/) [Cannabis Care](https://cedclinic.com/book/) [https://cedclinic.com/contact/](https://cedclinic.com/contact/) RELATED READING AT CED CLINIC Continue exploring the evidence [What New Research Says About Cannabis And Testosterone](https://cedclinic.com/what-new-research-says-about-cannabis-and-testosterone/) This article reviews recent findings on how [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) may influence testosterone levels and [male reproductive health](https://cedclinic.com/male-reproductive-health-cannabis-primate-study/). [Read More](https://cedclinic.com/what-new-research-says-about-cannabis-and-testosterone/) [Complex Correlations Between Endocannabinoids and Sperm Quality in Swiss Men](https://cedclinic.com/endocannabinoids-sperm-quality-correlations-swiss-men/) Explore the intricate relationships between endocannabinoid levels and [sperm quality](https://cedclinic.com/male-fertility-cannabis-effects-sperm-count-quality/) in a Swiss male population. [Explore Study](https://cedclinic.com/endocannabinoids-sperm-quality-correlations-swiss-men/) [Association Between Marijuana Use and Cardiovascular Disease in US Adults](https://cedclinic.com/marijuana-use-and-cardiovascular-disease/) An important study examining the links between [marijuana use](https://cedclinic.com/should-i-post-this-here-or-on-r-marijuanaenthusiasts/) and [cardiovascular health](https://cedclinic.com/substance-use-stroke-risk-specific-misuse/) outcomes in adults. [Learn More](https://cedclinic.com/marijuana-use-and-cardiovascular-disease/) Have thoughts on this? Share it: [X Share on X](https://twitter.com/intent/tweet?text=Marijuana%20Smoking%20and%20Markers%20of%20Testicular%20Function%20Among%20Men%20from%20a%20Fertility%20Center&url=https%3A%2F%2Fcedclinic.com%2Fmarijuana-reproductive-effects-testicular-function-men%2F) [in Share on LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcedclinic.com%2Fmarijuana-reproductive-effects-testicular-function-men%2F) [Share on BlueSky](https://bsky.app/intent/compose?text=Marijuana%20Smoking%20and%20Markers%20of%20Testicular%20Function%20Among%20Men%20from%20a%20Fertility%20Center%20https%3A%2F%2Fcedclinic.com%2Fmarijuana-reproductive-effects-testicular-function-men%2F) [Follow on Instagram](https://www.instagram.com/drbenjamincaplan) [Read more on Substack](https://doctorapprovedcannabis.substack.com/) [Subscribe via RSS](https://cedclinic.com/feed/) ### Related --- ### Verification & Medical Governance - **Lead Clinical Author:** Benjamin Caplan, MD - **Credentials:** Board Certified in Family Medicine (ABFM), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House). - **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`). - **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/). - **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637). - **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).