This piece examines how rising cannabis use is intersecting with male reproductive health concerns, highlights recent research connecting marijuana to poorer sperm quality, and lays out expert guidance for men hoping to conceive. It explains biological reasons why cannabis can affect hormones and sperm, notes key study findings, and shares practical recommendations around stopping use before attempting pregnancy. The goal is to give clear, science-backed context so men and couples can make informed choices about cannabis and fertility.
Awareness about infertility often focuses on women, but male factors are significant and too often overlooked. During National Infertility Awareness Week medical professionals are calling attention to how both recreational and medical cannabis use could play a role in reproductive problems. That shift matters because planning for a family should involve both partners and clear information about avoidable risks.
Some data point to troubling links between cannabis and pregnancy outcomes in women, which raises concerns for couples trying to conceive. A 2025 Harvard-linked study of women undergoing fertility treatment found twice as many miscarriages among those who used cannabis compared with non-users. While human evidence still has gaps, these signals push clinicians to advise caution.
“This is especially disheartening when men and women are actively trying to conceive and start a family,” Dr. Alta DeRoo, chief medical officer of the Hazelden Betty Ford Foundation in Minnesota, told Fox News Digital. Experts note that fertility workups should include a full evaluation of both partners, not just a single semen test. Lifestyle choices such as tobacco or cannabis use are routine parts of that assessment.
“Many individuals think infertility is a woman’s problem, [but] male infertility is common and under-evaluated,” Seminar told Fox News Digital. Worldwide estimates suggest about 10% to 15% of couples face infertility, and male factors contribute to roughly 45% of those cases. Normal sexual function does not guarantee normal sperm production, which means testing and evaluation are important when pregnancy is delayed.
Clinical investigations have repeatedly flagged cannabis as a possible culprit in lower sperm counts and reduced semen quality, especially with frequent use. A 2019 review in The Journal of Urology linked cannabis, particularly the smoked form, to declines in semen parameters. Those effects can include lower sperm concentration, poorer motility, and higher rates of abnormal morphology.
One large study of 1,215 healthy young Danish men found smoking cannabis more than once per week was associated with a 28% lower sperm concentration and a 29% lower total sperm count. When marijuana was combined with other recreational drugs more than once a week, the drops in concentration and count were even larger. These are notable differences for couples trying to conceive.
“The sperm count or volume can be lower, and those sperm produced may be malformed and unable to swim effectively,” the doctor said. Biologically, the body uses its own endocannabinoids to regulate key functions including reproduction, and cannabis compounds like THC and CBD can interact with those same systems. That interaction may disrupt hormone signals from the brain that govern testicular sperm production.
Hormonal shifts tied to cannabis use could include changes in follicle-stimulating hormone and luteinizing hormone, which are important for testicular support of sperm production. Human research on hormonal effects is mixed, but the practical impact on semen quality has shown consistent patterns in several studies. Because sperm development takes about three months, effects from quitting can take time to reverse.
Practically speaking, fertility specialists recommend that men stop using cannabis if they are trying to conceive. Any negative effects on sperm quality may be reversible, and abstaining for at least three months before attempting conception allows a full cycle of healthy sperm to develop. Professional societies also advise avoiding recreational drugs while trying to maximize chances of a healthy birth.
Cannabis is widely used in the United States, with CDC data showing millions of users and a sizable minority developing problematic patterns. Recreational legalization in many states has increased access, but greater availability does not eliminate health trade-offs. Couples who want kids should weigh the evidence and consider stopping cannabis well before conception as a straightforward step to protect fertility.
