Frequent use causes some lung and throat irritation.
Your nose and mouth tubes connect, then the single tube (trachea?) branches into the bronchial tube to your lungs and the esophagus to your stomach.
Marijuana cannot cause psychological problems alone, but it can speed or exacerbate their onset in those that have a pre-existing propensity for them.

BUT- You just have paranoia. It might be the strain, it might be the amount, but just try to stop smoking before you get there.
Cheers for the advice there, yeah thats what i kind of thought, it might be the strain because i use a new dealer now, but i use quite a few different ones and havn't noticed a pattern.. eg. not noticed a purticular dealers weed gives me these affects.

Maybe try exercising, my brother got really bad head and back pains for a period of time, I think he still gets it mildly. Stop smoking cigarettes, you say your really thin, even though you eat a lot. That means your heart already is beeting pretty fast, cigarettes are just going to make your lungs 50x worse. Take some shrooms and think about what good cigarettes do for you.
Good advice there, been thinking to myself i need to exercise more, need to build me some muscles and put some weight on, and i do have some back pains, have done for quite a while now, about the head thing, i smoked quite alot the other night and my head felt like it was going to explode.. felt like several people pushing my head in.

I really do need to quit smoking, i need something to really make me do it though because i find it really really hard to.. Been meaning to take some shrooms, might have a trip to amsterdam planned, if it does through then im gonna try some shrooms.

Cheers