No one vomits, but there is blood falling out of mouths near constantly.
A man is teased earlier on in the film for being squeamish at the sight of blood, told he'll "puke" at the sight of it. This never comes to fruition in the film.
A man sits on his girlfriend so she can’t move and then puts a pillow over her face. He holds it there despite her pleas and eventually takes it off and apologises.