And that's precisely why she must take a great deal of caution with the things that she eats and the things that she ingests and drinks with the people she interacts with and the places she visits. Because there are many different types of factors found in in our surrounding environment that can have a negative impact on the way that fetus develops inside the uterus of that pregnant individual. So in this lecture we're going to briefly discuss eight different categories of factors that can have a negative impact on that development on that developing fetus. So let's begin with number one smoking, perhaps the most common one. So why is smoking bad for us? Why are cigarettes bad for us?