I don't have any references from the top of my head, but I bet you wouldn't find articles describing effects of drugs on 5 year-olds, either. But this is precis

I don't have any references from the top of my head, but I bet you wouldn't find articles describing effects of drugs on 5 year-olds, either. But this is precisely my point: we don't know for sure, but even if there's a small chance that my child's psychology will be disturbed, I don't want to risk it.