What evidence is it going to take? →
To think that people who believe staunchly in forbidding marijuana will be persuaded to somehow feel differently is very optimistic; but for people who believe in facts and science, the fact that marijuana is forbidden but cigarettes and alcohol aren’t, starts to seem less and less self-evident.
Opposition to marijuana is a matter of principle, and matters of principle are rarely affected by science.
(Via Tim Bray.)