I've met someone who takes Marinol and I can say that when they are taking it they are twitchy, speedy, nervous, can't sleep, and in general very unpleasant to be around. When they are not on it, they act normally. Compare that to the stoners I know who are relaxed, sleep well, and are generally fun to be around.
The synthetic version seems horrible. The natural product seems to be a safer bet. It's much cheaper too until you add the cost of jail time, possibility of being shot by the police, and the total destruction of your life by the criminal justice system. But hey! We have to keep the evil plant off the streets, right? Think of the children!
Just don't think about the children on chemo, have MS, or suffer from any other disease the plant helps with. It might mess with your dogma.