The only time I have thrown up from smoking is if I smoke after been out on the booze. Not a good combo.
I have had many a whitey over the years and seen friends spew from throwing a whitey. I have span out to the point of not been able to sit up, in fact that used to be my aim before bed many years ago.
I threw a whitey in Amsterdam once, second time in that lovely place. I did the usual thing of buying a small amount of different herb from each coffee shop and of course its only polite to have a few coffees and skin up. I had had a few strong joints and by the 4th or 5th coffee shop I sat at the bar and proceeded to rack one up. Half way through I noticed my rizlas (papers) were a bit wet, I was sweating so much it was dripping into my joint. I figured I would head to the toilet and sit down. I got so hot I thought in my stoned mess of a mind that taking off some clothes would be a good idea. They were soaked through. I took off all my clothes in a toilet cubical, still sweating, oh dear, what can I do? It seemed a good idea to rap myself like a mummy in toilet roll to absorb the sweat.
30mins later the owner and proprietor of the coffee shop came knocking on the cubical to see if I was ok. I had to open the cubical door and his face was a picture when he saw me wrapped up like the mummy. He thought it was very funny. I was as white as the toilet roll that covered me. He was a good bloke, made me a toasty and gave me a glass of orange to bring me back to life.
The coffee shop was Rookies! Says it all, I was only 18 at the time.