How does taking drugs and smoking affect a baby that is still in its mother’s womb?

Question: How does taking drugs and smoking affect a baby that is still in its mother's womb?
- Keywords:
  baby,
  drugs,
  smoking,
  womb
Asked by Raccoons 4 life <3 to Ed, Hugh on 20 Mar 2015.
- Hugh Harvey answered on 20 Mar 2015:
  
  Drugs and chemicals in smoke can cross the the placenta which is the feeding organ for a baby inside the womb.
- Ed Rial answered on 20 Mar 2015:
  
  Hi Raccoons
  
  Drugs and chemicals interrupt how a body should work normally. In an adult the systems like the liver and kidneys are developed enough to cope with some of the short term effects of these drugs, but a developing foetus doesn’t have these working properly.
  
  Because a baby in its mums womb is still growing so rapidly then the damaged cells are still needed to replicate and grow.
  
  All in all it’s not good 🙁
  
  Stay awesome!
  
  Ed
  
  #VoteEd!

Question: How does taking drugs and smoking affect a baby that is still in its mother's womb?