Cannabis Use and Male Fertility Concerns Surface Amid Drug Policy Shifts

As the Trump administration moves toward looser federal restrictions on drugs, including easing regulations on state-licensed medical marijuana, medical experts are raising concerns about cannabis use and its potential health implications. During National Infertility Awareness Week, particular attention has turned to a less discussed issue: the impact of cannabis on male fertility.

“This is especially disheartening when men and women are actively trying to conceive and start a family,” said Dr. Alta DeRoo, chief medical officer of the Hazelden Betty Ford Foundation in Minnesota.

While cannabis use has been linked to reproductive health changes in both men and women, misconceptions about fertility problems persist. Many assume infertility stems primarily from women’s health issues, but data suggests otherwise.

“Many individuals think infertility is a woman’s problem, [but] male infertility is common and under-evaluated,” explained Dr. Stephanie Seminar, chief of the Reproductive Endocrine Unit at Massachusetts General Hospital. Among the 10-15% of couples worldwide experiencing infertility, male factors contribute to approximately 45% of cases.

The evaluation of male fertility extends beyond basic semen analysis to include examination of sexual dysfunction, exposure to toxins, tobacco and cannabis use, childhood illnesses, and past testosterone use.

Cannabis Effects on Male Reproductive Health

Heavy and chronic cannabis use can negatively impact male fertility in multiple ways, according to experts. These effects include alterations in reproductive hormones and decreased sperm quality.

“The sperm count or volume can be lower, and those sperm produced may be malformed and unable to swim effectively,” Dr. Seminar noted.

Research supports these concerns. A 2019 review published in The Journal of Urology found associations between cannabis use, particularly smoked cannabis, and reduced semen quality. Another study of 1,215 healthy young Danish men revealed that smoking cannabis more than once per week was associated with a 28% lower sperm concentration and 29% lower total sperm count.

The impact becomes even more pronounced when cannabis is combined with other recreational drugs, potentially reducing sperm concentration and count by 52% and 55%, respectively.

How Cannabis Disrupts Reproductive Function

The human body naturally produces endocannabinoids to regulate vital functions, including fertility. Cannabis mimics these natural molecules through its two main compounds: cannabidiol (CBD) and tetrahydrocannabinol (THC), which interact directly with the body’s endocannabinoid system.

When cannabis is consumed, these external cannabinoids bind to the same receptors as natural endocannabinoids, potentially impairing reproductive function. Research suggests cannabis may interfere with the brain’s regulation of reproductive hormones, altering levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which signal the testes to support sperm production.

This hormonal suppression could contribute to fertility challenges, though researchers note that evidence in humans remains mixed and requires further study.

Reversible Effects and Recommendations

The good news for couples planning to conceive is that cannabis-related fertility effects appear largely reversible. Experts recommend that men stop using cannabis if they plan to conceive, as higher usage correlates with worse fertility outcomes.

“Stopping the use of cannabis improves other areas of health in a person’s life, and conception or pregnancy can be a strong motivator for abstinence,” Dr. DeRoo explained.

Medical professionals suggest discontinuing cannabis use at least three months before attempting conception to allow the body to generate a full cycle of healthy sperm. The American Society for Reproductive Medicine also encourages couples trying to conceive to avoid recreational drugs to maximize their chances of a healthy birth.

Cannabis Use in the United States

Cannabis remains the most commonly used federally illegal drug in the United States. In 2021, nearly one in five Americans—approximately 52.5 million people—used cannabis, according to CDC data. About 30% of users may develop cannabis use disorder at some point, adversely impacting their daily activities.

The legal landscape continues to evolve rapidly. Recreational cannabis is now legal in approximately half of U.S. states, while medical marijuana has been legalized in well over 30 states. Only a small number of states continue to prohibit most forms of cannabis use.

As policy changes progress, medical experts emphasize the importance of understanding potential health implications, particularly for those planning families, to make fully informed decisions about cannabis use.