Hey dude. Well I'd say vomitting is just your body's way of rejecting the foreign substance. Lots of people throw up the first time they get drunk (among other times), a guy I knew would throw up everytime he did shrooms but then he was good to go. Another guy I knew used to throw up from weed occasionly and he probably threw up his first time. I'd be surprised if you threw up the next time. Seems normal to me just not that common.

Like any drug, weed puts you in a different head space so sometimes you panic or you get paranoid. Some people are more prone to panicing, usually people that haven't been smoking that long or they're just the type of person to panic. It effects people different. But all in all weed's a pretty safe drug. Smoke on dude.