What surprises me the most is that we have accepted sugar, alcohol, cigarettes and a ton of mass manufactured food which are harming us. I am struggling with high blood glucose for 12 years. Yet, the substance which I can grow in my* own backyard and may actually not be as harmful is just brainwashed out of my limits.
edits: you to me
It is often argued that some of generally illegal substances like marijuana is only toxic to comparable extents as legal substances, but there are observations that it seem to trigger some types of megalomaniac schizophrenia, so the fence probably has reasons to be there, I think.