I say what everyone else is saying.. stop smoking cigs. They're horrible for you. It's easier to stop now while you're young. Definately worth it, though it may suck at the beginning.

But anyways, I have never met anyone or talked to anyone that has had the problems you described.. except when something else was wrong not weed related, such as a cold, mono, etc. I'd find another doctor.. if you're a student, try your school's health clinic. But definately get that stuff checked out.. chest pains aren't normal.