This site has the information for Marinol:
http://www.rxlist.com/marinol-drug.htm
“Medical marijuana” is just a fraud, pure and simple. Smoking marijuana has no medical use whatsoever, and smoking anything is dangerous.
That said, marijuana is MUCH less of a public health hazard than alcohol. Potheads do not get violent, do not commit crimes of passion, and are not feared by the police the way that they fear people who are drunk. Just imagine what a disaster Woodstock would have been had the drug of choice been beer rather than pot! It is not clear that there has ever been anyone who has died from marijuana use. But potheads can suffer other effects — I had a roommate flunk out of college because he was high on pot for the entire semester.