Why do pregnant moms do drugs?

The reason why any mother would do drugs during or after her pregnancy is because they are extremely selfish. They dont love and care about their child enough to stop either. They dont worry about how emotionally scarred the child will become once the kid finds out (and they eventually do find out) that their mother is spending money on drugs when it should be spent on other things or that their mother is ruining her health and well-being just to have a good time. The mother is so selfish and messed up to worry about their kid not being able to fully trust anyone ever again. All because the mom is too worried about getting high. Its a shame.