Hello... My 21 Year Old Lives In Chicago And We

Hello... My 21 year old lives in Chicago and we have had problems with her regarding her "social" use of marihuana... Ehe cites Harvard and CNN reports which claim that marihuana is not that bad, in fact in some cases can be beneficial... Now she tried to donate blood and was turned down because of low iron lever in her blood... I am wondering, could the marijuana smoking have anything to do with this low iron level???