Projectile Vomiting healthy?

When a person vomits important fluids and electrolytes are lost. This is not a good thing. Also the vomit could cause serious erosions in the esophagus and mouth since the vomit contains stomach acid (hydrochloric acid) which is highly irritating to tissues outside the stomach. Your friend's fun could turn into a serious medical problem. He should stop doing this. There's nothing funny about puking.