Nerviousness with weed...
Really what I think it is, is that you just inhale too much. I have almost thrown up becuase I tried to take the biggest hit I possibly could. But weed itself should never make you throw up, It's suppose to help you NOT throw up!!
My friend who is like almost 30, wont smoke becuase he says everytime he smokes his legs go numb. Weird huh?? But smokin just aint for some people i guess. You dont have to be worried about throwing up when smokin unless you take massive hits. Either that or your allergic to smoke, but I really dont think ANYONE is allergic to smoke, seeing that thc is the same thing as CB-1 and AS-2 receptors in your mind. ( i think that the second Intials are not spelled right.