Does smoking weed make you vomit have diarrhea?

It can. Actually, for most people (like those receiving cancer treatment or as a drug reaction to many drugs), cannabis tends to reduce vomiting. However, there are some people who have what is called cyclical vomiting disorder, which in some cases may actually be caused by marijuana. If you routinely are getting these symptoms and yet cannot stop your use of marijuana, get help from doctor/counselor.