There's no such infringement. There's no constitutional right to abuse drugs. I'm not a big fan of the way they are going about the WOD, because I don't think they are doing enough. We should use the military and destroy the production of these drugs at their source, for one thing. But make no mistake; to the extent there's any rights violations going on, we need to harp on those specific violations. Make sure we are talking about valid constitutional rights and not invalid wants called "rights" when one desires, for example, to be able to smoke pot.
Why did you write me again?
Because you tried to argue a point they didn't make. If that makes you feel better about your position, fine, but don't be surprised if someone points it out.
There's no constitutional right to say "The sky is blue today". By your reasoning, it would be perfectly acceptable to imprison people for uttering just those words, or for any other reason, at the whim of the federal government, because it is not listed in the Constitution.
The Constitution lists very few rights. What it does do in great detail is list powers granted to, and limitations placed upon the federal government. In fact, the reverse of what you said is the actual truth - The federal goverment has no right to make the consumption of a particular substance illegal.