Would you tell me what section of the Constitution specifically grants Congress the authority to devise any federal statutes?
Article I, Section 8: "The Congress shall have Power [...] To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof."
Again: Would you tell us which section of the Constitution you believe delegates to Congress the authority to regulate intrastate drug policies?
No, I want you to honestly put your thinking cap on.
There are thousands of federal regulations and statutes.
What you folks seem to be trying to argue, is that the federal government has devised no other laws. It obviously has.