You definately need to have things checked out by a dentist. They will likely want to check the teeth for decay, take some xrays,make sure the nerves in the teeth are healthy. Depending on the extent of whats fractured off the teeth they will recommend treatment, possibly crowns, if the nerves in the teeth are compromised possibly root canals. Usually teeth are salvageable, but it can get involved and expensive. (hopefully the broken pieces are minor and will not require this) when people have severe recession grafting is recommended. However another concern will be the supporting bone around the teeth. I hope you have are able to stop your tabacco habit. There is a risk of mouth cancer as you proably know and you are so young! I have seen the effects and it is not pretty. Don't be afraid to get things checked out. At least that way you will know what needs to be done. Don't be embarrassed either, and be honest with them about the tobacco it is important for them to check the health of your tissues as well.