Im not going to tell u how bad smoking is, its a really stupid habbit, im trying to quit myself. You said your father has known for 2 years now that you have smoked and its starting to really affect him now? Perhaps he is stressed out about something else and is looking for a reason to take it out on. Oviously this issue is bothering him alot and seems like a good way to take out some frustration. You should try to quit smoking, but do it for yourself! The best thing to do is sit down and talk to him. Maybe ask him how hes feeling and if there is anything you can help with, Good luck and keep us posted!