The flaw in this reasoning is that you assume that drugs are the direct cause of the fact. If those parents have such serious issues, and marijuana wouldn't ev

The flaw in this reasoning is that you assume that drugs are the direct cause of the fact. If those parents have such serious issues, and marijuana wouldn't even exist, they would be nonetheless drunk as hell, or glued to some videogame, and so on, and the baby would be in the exact same conditions. Such argument against drugs is an oversimplification of human behavior, which makes easy to point fingers, in this case, against light drugs.