Won't work.
BTW, you are entitled to your reading of the Constitution, of course, but I bet you that if needed my side could get a Constitutional amendment in place that would outlaw both drugs and druggies.
In that case your argument would be revealed to be a hollow shell designed to do nothing but mislead people from the real problems ~ and those are misuse of drugs by druggies.
Let me repeat it again, druggies are not invisible. The rest of us know what druggies are up to.
Since the original post you replied to was not made by a druggie, nor did it advocate free drugs, but simply pointed out the Constitutional problems with the current drug war, then there has to be more to it than that. Tell me more about this glorious revolution of yours, and this new, improved Constitution. You plan on writing that yourself?
I would wager my lifes fortune that if you tried, you could not get a constitutional amendment banning MJ if your life depended on it in the next 15 years.