hmmm, "the constitution always grants..." what is the constitution? Are you personifying it? Is it a contract and if so, how did it become applicable to me? Is it not simply a written instrument that no one bothered to sign? I'm borrowing lines from Lysander Spooner's No Treason: The Constitution of No Authority.

From the appendix:

"Inasmuch as the Constitution was never signed, nor agreed to, by anybody, as a contract, and therefore never bound anybody, and is now binding upon nobody; and is, moreover, such an one as no people can ever hereafter be expected to consent to, except as they may be forced to do so at the point of the bayonet, it is perhaps of no importance what its true legal meaning, as a contract, is. Nevertheless, the writer thinks it proper to say that, in his opinion, the Constitution is no such instrument as it has generally been assumed to be; but that by false interpretations, and naked usurpations, the government has been made in practice a very widely, and almost wholly, different thing from what the Constitution itself purports to authorize. He has heretofore written much, and could write much more, to prove that such is the truth. But whether the Constitution really be one thing, or another, this much is certain – that it has either authorized such a government as we have had, or has been powerless to prevent it. In either case, it is unfit to exist. "

The government's arbitrary prohibitions of demonized substances is a perfect example of how the "constitution" has utterly failed to protect one of the most basic and fundamental of human rights i.e., the right to control what we possess and consume. It has not served to defend the people from this arbitrary usurpation.