Replacement coils are what you need to continue vaping happy. It's important to change your coils when you notice the flavour of your e-liquid has gone or it tastes burnt.
Many people rely on their vaping kits to help them through the day and to help stop smoking, so its always a good idea to make sure you always have spare replacement coils and other accessories always in your vaping arsenal.
Make sure to properly prime each coils before use.