You know, for the last 8 years I was in the Navy, I was a Drug and Alcohol Program Advisor. That meant that I needed to know how to spot drug and alcohol abuse in sailors, as well as had to know the effects of them and how harmful they were to the body.
Out of all the research that the Navy made me learn, I could never figure out why it was illegal. It was certainly less harmful than alcohol, and there were never any withdrawl symptoms if you suddenly stopped smoking cannabis.
Then, after I retired from the Navy, I did lots of research on the 'net as well as other places, checking out how people used it, what happened, etc., and after about 6 months of research, I decided to do the ultimate experiment and try it for myself. Been 420 friendly ever since.
Then, when CO legalized it, my roomie and I started going up there on a regular basis to check out the different varieties. In doing so, I came in contact with a lot of veterans (I always have a US Navy ballcap on when I go out), who told me that they came back from the war with lots of problems, and many of them were taking 10 to 15 pills PER DAY! And, they told me that when it was legalized, many of them started trying it as a relief from PTSD and the like. Guess what? Almost all of the veterans said that because of the relief from cannabis, they were able to wean themselves off of all the drugs the VA had them on.
The only reason that marijuana was made illegal in the first place was because of racism (Anslinger hated black and brown people, the largest consumers of marijuana at the time), and greed, because Herst and Dupont didn't want to compete with hemp. Herst because of his timber holdings (he didnt want hemp paper because of that), and Dupont because of their new research into things made with crude oil, and they didn't want to compete with hemp oil.
If you still support keeping marijuana illegal, then you are also supporting racism and greed.