There IS no better argument. Pardon my language, but I think a large proportion of the HN community especially agrees with the sentiment of STAY THE HELL OUT OF MY BUSINESS. If what I am doing has no or marginal negative effect on others, as a free human being with rights to self actualization, personal fulfillment, and self-determination, no one has any right tell me what I can and cannot do with myself.
The drug war is fundamentally about the restriction of human rights and invasion of privacy.