Because mice are little they metabolise or break down the drugs very rapidly. Their heartbeat is about 400 hundred beats per minute compared to 70 for humans. Thus the behavioural effects of marijuana on mice are gone within hours. Marijuana taken orally is almost one third as potent as when it is smoked. This is one reason why the doses aren't quite equivalent, but it eds up that the long-term effects on the reproductive system are about the same.
Human beings do consume marijuana in some places by eating it.
So it is not unrealistic for us to do so with these studies in animals. No, I haven't in any yet given it to both the mother and father. I've always elected to give it to one or the other, because until you know what marijuana does to each other separately, there's really no easy way to evaluate the contribution of each parent to the outcome of the offspring. Fetuses are exposed to the various cannabinoids through the placenta, the organ that connects the fetal sac to the mother and through which nutrients flow to the fetus. We found two major effects of marijuana during mid-pregnancy.