First, a better worded argument than most I could make, from somebody who knows more about it
There’s just a point I’d like to make in addition. Marijuana was never banned because of its health effects. It was banned because William Randolph Hearst was sick of hemp paper competing with wood-pulp (since it was cheaper, more durable, and grew faster), so he made this little film called Reefer Madness to help stir up anti-marijuana sentiment, creating a new Great Evil that needed to be banned.
That, ladies and gents, is why we have to cut down forests in order to make paper. If we don’t go ahead and legalize (and tax, of course) pot, putting a ton of crooks out of business and creating an entire new industry, let’s at least legalize hemp for the perfectly legitimate uses it has. It can’t be used to get high, and it’s a lot greener a product than most of what we’re using now that it could substitute for.