Let’s be clear; up to this point, we’ve been referring to the use of THC-rich cannabis strains, as that’s what’s most popular these days. CBD oil, though, has been rapidly becoming more widely consumed. That, of course, is because it can’t get you high, has been observed to exhibit potential therapeutic effects, and is sold everywhere from gas stations to supermarkets.
In turn, we should take these studies with a grain of salt when they claim cannabis itself causes birth defects and other issues later on. On the other hand, though, it also means that other studies with these oversights need to be reconsidered as well.
Risks of Foreign Substances in CBD Oil
While some cannabis supporters will say there’s no connection between cannabis and pregnancy issues  , a study released in 2020 says otherwise. Researchers from around the UK observed over 5,000 pregnant women, dividing them into five groups: those who never used cannabis, those who only used it before pregnancy, those who stopped using it right before, those who used it but stopped before the 15-week mark, and those who used it after 15 weeks.
If you consider other equally recent and valid studies, however, you could also argue there is insufficient evidence to claim cannabis use during pregnancy is wholly unsafe either. Researchers at NYC’s Columbia University, the New York State Psychiatric Institute, and Australia’s Swinburne University looked at 184 studies  dating up to December 2017, the combination of which describes 1,000+ subjects between 0 and 22 years of age.
Age 6 – 10 years:
There is no known safe amount of cannabis use during pregnancy.
Age 14 – 18 years:
Risks to a child’s brain development
These risks can lead to health problems for a growing child.
If you are unable to stop using cannabis completely, try using less, and less often.
Talk to your health care provider about breastfeeding.
Until more is known about the short and long-term effects of cannabis, it is safest to avoid using cannabis when pregnant and breastfeeding.
Obviously, if you are both smoking marijuana, you risk increasing the chances of infertility as a couple.
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.
Despite the relaxation effects that many people associate with marijuana use, research has shown marijuana has negative effects on the male sexual response.
Research suggests that marijuana can negatively affect female fertility in the following ways:
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.
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.
Steven Gans, MD is board-certified in psychiatry and is an active supervisor, teacher, and mentor at Massachusetts General Hospital.