And that's exactly why smoking is very, very bad for that developing fetus. Now, let's focus on different types of drugs. So we have medicinal drugs, we have recreational drugs and then we also have alcohol. All these things have a very bad effect on that developing embryo and that developing fetus. Now, what do we mean by medicinal drugs? Well, these are those legal drugs that you can get in a pharmacy or you can get at the physician's office.