Ludwig von Mises on the government's attempt to eliminate vices

It is an established fact that alcoholism, cocainism, and morphinism are deadly enemies of life, of health, and of the capacity for work and enjoyment; and a utilitarian must therefore consider them as vices. But this is far from demonstrating that the authorities must interpose to suppress these vices by commercial prohibitions, nor is it by any means evident that such intervention on the part of the government is really capable of suppressing them or that, even if this end could be attained, it might not therewith open up a Pandora's box of other dangers, no less mischievous than alcoholism and morphinism.

~ Ludwig von Mises, Liberalism