It really depends on what drugs, etc. but yes, drugs can harm a sperm and therefore have an influence on the baby. Sometimes this can result early on in a m/c (because it is nature's way sometimes of realizing that there is a defect in the fetus) but sometimes it can go undetected or be just fine. It is very important that you are not doing any drugs, smoking or drinking during your pregnancy as well. It would be difficult to assess the possible long term damage done at this point- some babies are resilient and will be ok, others may have learning difficulties while others still may have developmental problems or physical problems. The other problem is, too, of course, is that the child's father is a drug addict and won't be able to parent this child (safely). If you have another person that is a drug addict around or you have an environment that is unsafe, the baby most likely would be placed in the care of social services.
If you're not already pregnant and you're in the process of choosing whether to get pregnant with a drug addict, don't do it.
Your baby needs a father and that guy won't be it. Also, as waiting said, a few drugs can affect sperm. But more importantly, that guy will not be an appropriate father and since personality is genetic, the chances that your baby will have personality and coping problems that lead to drug use are higher.
At any age, but certainly since you are only 18, I would reconsider any action that might lead to having a baby with a drug addict. You are letting yourself and your child in for a world of heartbreak if you do.
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