You sound like Nancy Pelosi - 'Are you SERIOUS?' Be that as it may, answer the question put to you. It's a very simple one.
Which section of the Constitution do you believe delegates to Congress the power to regulate intrastate drug policies?
Domestic tranquility, justice, common defense — all that my friend. Control of the borders from violent drug-crazed criminals — working closely with local police — is essential to keep cocaine out of Slurpees in Seven-Eleven. Only a late-sleeping overeducated libertarian could fail to see that.