yes "vomıt" is a rather vulgar term in english and usually we say sıck for vomıt too. So can you say sıck ın turkısh to mean vomıt or do you have to use the specific of kusmuk? Doctors would say vomıt but they are allowed to ! ;)
I wouldn't say that vomit is vulgar (American English), but I think "throw up" is used much more often as a euphemism for vomit. Does Turkish have any similar expression, or is this act strictly "kusmuk"?