“Medical marijuana already exists. It’s called Marinol.”
No, it does not. My wife, a transplant patient, takes it in between bouts of nausea and it stimulates her appetite somewhat but does nothing for nausea - other than occasionally inducing it. Her transplant surgeon stated that he wished he could prescribe real marijuana for her.
He has a point there. Marinol is made from synthetic THC. I do not know how potent synthetic THC is compared to the real THC. The dosage of Marinol can be controlled. Options to administer the drug need to be improved.
Other ways of administering Marinol are being looked into, according to Google sources, such as a patch or inhaler. A patch or inhaler could be more effective than taking a pill for nausea, especially if you keep throwing up the pills. We had to use suppositories for one of our children when he had a major vomiting problem; had the flu.