I heard it claimed that the US Constitution and the Bill of Rights are both on hemp paper.
This doesn’t seem all that far-fetched to me considering that hemp was grown by many of the founding fathers as a useful (and non-recreational) crop.
Of course, I favor legalization, so I recognize that I might be projecting a little wishful thinking on this possibility. So what’s the deal?
According to http://www.britannica.com, the Declaration is written on parchment, so the answer to that part of your question is no.
And this site, whose authority I cannot vouch for, claims the Constitution is on parchment as well.
I would be surprised if the Founding Fathers would have trusted anything less than parchment for documents they saw as important.
We can always smoke it and find out. 
Being for legalization, i fell for that one too. Hemp paper was used considerably in Revolution times. It was considered a lower grade paper like notebook paper today. Parchment was considered higher quality. Could you imagine the Declaration of Independence written on a piece of notebook paper?
“Okay, guys, here’s my first draft: it’s written on a bar napkin, sorry about that…”
(The Britannica also refers to the original document of the Declaration being on parchment.)
Which KneadToKnow already said. Never mind.
I always thought it was the Deloration of Independence that was written on hemp. Can anyone help me out on this one?