@Screamin Like @MT-Elk-Hunter says both an oven and a smoker are basically boxes with heaters in them or attached. You can absolutely do summer sausage in an oven, in fact a lot of people do. You might want to consider adding Hickory Smoke Powder to give it a smoke flavor. Also, how low your oven will go will matter. If you have an oven that will run at 120° you are fine, if it won’t you might have to prop the door for an hour or so to start your smoke schedule around 120° and then step it up as you go.