Definately see a doctor ASAP. Whenever you are bleeding somewhere internally it is not a good sign. With just this symptom it could be anything from something minor (like your cheek being damaged from something eaten thats having a hard time healing) to something major (I don't think I need to scare you by getting into this, I'm sure all these major possibilities have already crossed your mind). Regardless, you need to nip this in the butt and quick. Once may be nothing, but the continual presense of blood in your saliva over a month means something is wrong. Your smoking may be a clue, but it could also be unrelated to this. You can't be sure without further investigation but, I really can't stress this enough, get on top of it and take the initiative in finding out what's wrong and fixing it. If it's nothing big then it'll fix it or stop it from growing worse and if, G-d forbid, it is something big then the sooner you act the more likely it can get fixed. Best wishes and let us know what you find out.
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"The courts that first rode the warhorse of virtual representation into battle on the res judicata front invested their steed with near-magical properties." ~27 F.3d 751
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