The human body produces substances, called endocannabinoids, that work in a similar way to cannabis. These endocannabinoids may not produce a “high”, but are of tremendous importance for the functioning of the neural network in the brain -- especially during the embryonic stage. If this network is interfered with as a result of too many circulating endocannabinoids, the development of the embryonic brain can be impaired. Researchers have now discovered what mechanism underlies the development of this impairment.