U.S. Constitution, Amendment IX:
"The enumeration in the Constitution of certain rights, SHALL NOT be construed to DENY OR DISPARAGE others (rights) RETAINED BY THE PEOPLE."
Crystal clear, concise, and unambiguous that the right to consume the chemical of your choice is retained by the individual and thus cannot be denied or disparaged by our federal government.
That is why the the first ten amendments are called the Bill of Rights.
FYI: My chemical of choice is beer and wine.