Yes, Marinol is better medicine than Marijuana, because Marinol has many of the same effects, but does not have the side effects. Smoking marijuana is like smoking cigarettes, in that it is ingesting smoke in the lungs. By taking Marinol, a person can have the same physical effects without having to worry about the problems associated with smoking.
Marijuana has been shown to have many positive effects on the health of it's users, lowering stress and relieving pain are the tip of the iceberg. More importantly, Marijuana is completely natural. We seem to forget that we, as human beings, also came from nature, and that nature provides for us that which we need. Not chemicals, not something manufactured for us, but something that came from the earth, like we did.