Something similar happened to my cousin about four days ago when he was smokin with me and my friend. We smoked like three blunts and he was super stoned like fallen asleep and shit when he was just sittin there. Then me and my friend went into the kitchen to get some food and all of a sudden my cousin got up and went into the bathroom and threw up. I think that if you don't smoke that much and you smoke alot of weed and get really blowed sometimes you can get sick.