Here is some reading and background information concerning nausea and medical marijuana. Please note some of these may not be the latest information but are included to offer a wide range of sources and opinions, they do not constitute medical advice, and in almost every case more research is needed before there is certainty.
How cannabis is used for nausea and vomiting relief
Is Marijuana an Effective Treatment for Reducing Nausea and Vomiting from Chemotherapy?
Regulation of nausea and vomiting by cannabinoids