For the past week ive had a very, very light cough that hasnt managed to go away, Ive been feeling drowsy and ive just found a small lump directly under my chin thats quite hard, and could easily be a gland.
Im 17 and dont smoke, but before last week i was with my grandad who smokes alot, which couldve easily caused the light cough.
Am I being paranoid? Or should I be concerned?

I think you're being paranoid :)

Now, when you say that the lump under your chin is hard, do you mean hard and rubbery, or hard like a stone?

Some of the symptoms of throat cancer are long-term hoarseness, trouble swallowing, ear pain, cough, change in the pitch of the voice etc.

Its more rubbery hard than stone hard, but then again you cant really squeeze it or change its shape. It feels like other things I know are glands, but may have tissue over it or something. it isnt painful.

I havent been getting any of those other symptoms apart from the cough, but its a very light, dry cough and a simple "ahem" usually gets rid of that. I heard difficulty swallowing is the main symptom. I ate dry bread, chicken, pork, biscuits and beef today and it all went down fine.

My doctor checked the cough out today (i went there on a different matter and i didnt mention the lump) and he said my airways sound all clear and it should go away within a few weeks, maybe sooner.

I think a few things have just come along at once (ive been getting migraines too) and ive ended up paranoid.

...hey again

No, the main symptom of throat cancer is hoarseness.

If the thing is not stone hard, then most likely it's not cancer....plus the fact that you're young makes it really unlikely too.