Well, recreational drugs includes drugs like cocaine and heroin and so forth. Marijuana is another recreational drug and all these different types of drugs can basically cause different types of problems. For example, let's focus on cocaine. So the problem with cocaine is that it can easily cross across that placental membrane and so that cocaine that damages that mother also ends up damaging that fetus. The problem is the mother is already fully developed so the cocaine actually amplifies the damage on that fetus because the fetus is still in its developmental stage. So cocaine basically leads to different types of physical deformities.