As legal access to marijuana continues expanding across the US, more researchers are studying the effects of tetrahydrocannabinol, (THC), in teens, adults and pregnant women. New research from Duke Health suggests men in their child-bearing years should also consider how THC could impact their sperm and possibly the children they conceive during periods of Marijuana use. This is a tale of marijuana, sperm, and epigenetics! Data for this podcast came from the recently published study from Duke researchers, published in EPIGENETICS, 19 December 2018 (Murphey et al) and the medical news update from MDLinks (12/19/18).