1. All the first things you listed wre legal, marjiuana is not.  That may or may not be a difference, but I have a feeling that it's hard to determine that someone died of something that they were using illegally. Not impossible by any means.  Hard, yes.

2. If you want a direct cause of death, tobacco doesn't kill anyone either.  The side effects do, but tobacco itself does not.  

Alcohol is similar. If you're looking at direct cause (as I think you are trying to do with marijuana), the only thing you can look at is something like alcohol poisening.  If you look at that, I'm sure the numbers will be far lower.

3. I can't believe that 0 die anyway.  It's a drug. Someone must have overdosed somewhere at sometime, someplace.  If it's a drug, and so many people are using it, it is utterlly impossible for no one to have died from it.  If people have died from asprin, people have died from marijuana, considering aspirin is just about the safest drug ever created.

4. If you take into effect side effects, or actions people do while under the influence, I'm sure that number will increase even more.

he Wilson administration did not criminalize marijuana, cocaine, and heroin because they were hazardous susbstances (although clearly the latter two can be in certain circumstances)

In certain circumstances? How about always?  If you can die after one use of something like heroin, I don't think "in certain circumstances" is exactly the right way to describe it's danger.

Are you really going to argue that America was a less economically productive or less socially cohseive place in the latter decades of the nineteenth century than it was after these drugs were criminalized in the 1910s?

Of course, if someone became unproductive because they were high, they would have just been fired and someone else hired for 10 cents a day, so even if a large percent of the working age population were druggies, what effect would it have? Not as much as it would today.

The state has no business telling me or anyone else what I can and cannot grow in my backyard and put into my body.

I tend to be in the "state has to protect people, even from themselves" class.  Obviously many people here are not.  This is the same type of argument used by people where I live to allow them to ride in the back of pickup trucks and drive motorcycles around without helmets so that they can wreck and split their head open without interference.  Hell, seat belt laws shouldn't even be allowed using your logic of, essentially, "i can do whatever the hell i want"

but I know people with serious chronic illnesses and injuries who don't respond to perscription pain medications

If you ain't responding to morphene, I have a feeling that you aren't going to respond to anything.

And I brought this up in another comment...is it that it really cuts pain, or do they just get high enough so that they just don't care that they have pain.  If thats the case, I'd hardly call that pain relief.