sometimes if you cough too much or too hard, u will throw up. this is the body trying to sooth the tiny hairs in your throat (which get scorched when you smoke which causes you to cough) with some liquid.

ive never heard of someone throwingup later on, i bet it was something you ate.

also pot can get old and go bad, mold will start growing on it. don't smoke moldy weed, it is, in fact, fatal if you smoke too much. a little bit will get you sick though, but it will get you sick pretty quickly