Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pregnancy and Substance Abuse ?
    ### Response:
    When you are pregnant, you are not just "eating for two." You also breathe and drink for two, so it is important to carefully consider what you give to your baby. If you smoke, use alcohol or take illegal drugs, so does your unborn baby.    First, don't smoke.
    