There are NO PROVEN STUDIES stating that smoking Cannabis while pregnant
causes unusualbrain development, or that it causes symptoms similar to FAS. Cannabis promotes neurogenesis, which means it encourages brain cell growth. Cigarettr smoking csn cause preterm labor, but there are NO STUDIES that show Cannabis use causes preterm labor.
The only proven study about Cannabis use during pregnancy is the Jamaica study, performed by Dr. Melanie Drehr, which I encourage everyone to look into.