I'd say that people have the right to partake in whatever mind altering substances they'd like even if 95% of others disagree. Your appeal to democratic collectivism is fallacious.
The rule of law and courts were supposed to protect such minorities (ie drug legalization through generalized privacy of Roe v Wade, and trade via the right to free speech). It's pretty fucked up that the legal system has rotted so thoroughly that the courts are harshly persecuting them while the majority of interested people dissent.
Then again, much of that rot is due to the "war on drugs" and its underlying philosophy that people exist to serve their government.
Unless you live in a jurisdiction where the purchase of narcotics is legal (Mars?) the meaning of "People have a right to buy drugs" is quite clear.
In a world where the laws you invoke are responsible for so much suffering and death, to come in with a "Well, legally" and pretend the moral dimension does not exist is... well, I've already said what that is.
Often times breaking a bad law, and helping others to break it, is an important step in moving public opinion, which is how you take it up with the Congress.
Try harder, like by working to convince the public that such a right should exist, so that other people join you in your effort to convince Congress to change the law.
Yes, radically changing everyone's idea about what rights should exist is hard.
Of course, you haven't provided any argument here for your position on rights, just a bald statement that the right you would like to exist does, as if that were some kind of uncontroversial, universally-accepted thing that required no justification.
And you've made a bald statement equivocating between the morality of legality of something.
Would you like a list of examples where extremely illegal actions are clearly and controversially moral, or can you think of historical examples yourself?
Legally, they do not. If you have a problem with that, take it up with (relevant to the federal laws at issue here) the Congress.