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How Marijuana Can Affect Fertility

Steven Gans, MD is board-certified in psychiatry and is an active supervisor, teacher, and mentor at Massachusetts General Hospital.

Although the link between marijuana and fertility is not straightforward—plenty of marijuana smokers get pregnant and get their partners pregnant—some research has demonstrated that marijuana use can negatively impact you, your partner, or the fertility of both of you.

Female Fertility

Research suggests that marijuana can negatively affect female fertility in the following ways:

  • Decreases libido. Even before intercourse takes place, marijuana use may decreases libido. And if you aren’t feeling in the mood, it’s that much more difficult to get started.
  • Increases the risk of miscarriage. Marijuana use also increases the risk of miscarriage. Marijuana is known to cross the placenta and may pose a risk to the fetus, although the effects of marijuana exposure in the womb are not as well documented as the effects of alcohol and some other drugs.  

Furthermore, the effects of marijuana on fertility seem to accumulate over time. This means that although teenage girls who smoke marijuana are more likely to get pregnant, by the time a chronic marijuana smoking woman is in her mid-twenties, she may be more likely to experience a delay in getting pregnant.

Male Fertility

Despite the relaxation effects that many people associate with marijuana use, research has shown marijuana has negative effects on the male sexual response.

  • Increases impotence. Cannabis use has been associated with sexual dysfunction, which can also have negative effects on the male ego. If your partner has been impotent, he may be feeling more pressure to have sex to get you pregnant, but be frustrated with his inability to do so. This can lead to misunderstandings between you that make it more difficult to have sex.
  • May lead to premature ejaculation. Marijuana use has been associated with premature ejaculation.
  • May decrease sperm count. A regular smoker of marijuana has a risk of having a lower sperm count.
  • Affects sperm structure and function. Additionally, the sperm produced by marijuana smoking has been associated with abnormal morphology (shape) and motility (its ability to “swim” and fertilize the egg).  

Quit to Prepare for Parenthood

Obviously, if you are both smoking marijuana, you risk increasing the chances of infertility as a couple.

Quitting marijuana can be harder than many long-term marijuana users expect, so you and your partner would be wise to quit as soon as possible, while you still have time to get help before getting pregnant. If either or both parents still use marijuana when the baby arrives, you are increasing the risk that your child may use drugs in the future, and parental drug use is implicated in many difficulties for children and families.

Your family doctor can help you with a referral to a counselor or clinic that can help you both quit. ​Couples counseling, which is offered by many addiction clinics, would be particularly helpful at this time. If you are already engaged in infertility treatment, coming clean about your marijuana could save you a lot of time, money, and heartache, if marijuana is one of the culprits for your difficulties with conception.

Learn about whether marijuana can cause infertility, including a review of research on marijuana's effects on women and men.

Does smoking marijuana seeds make your sperm sterile?

13 Answers

No, but it does present a problem when trying to get the little sperm generator up.

For a while there (rather a long time ago), it was urban legend that smoking pot made men sterile or, at least, had a negative effect on sperm motility. I smoked plenty and still got 2 kids. How’s that for scientific evidence?

Yes and no. This has been a persistent myth for over 40 years but it actually does have some basis in medicine. Basically the psychoactive ingredient in cannabis, THC reduces lutenising hormone (LH) in the genitals.

LH triggers ovulation in women and is involved in sperm production in men. Result: a short-term (four to five hour) decrease in reproductive ability. Long term cannabis users, however, build tolerance to this effect and are immune.

it doesn’t make you sterile but smoking marijuana can lower sperm count and sperm activity. In other words, it makes them as off kilter as anything else from a pot head.

Does smoking marijuana seeds make your sperm sterile?