[MrLeRoy]

"Though cannabis was widely cultivated in America for three hundred years, both as a fiber resource and for its medicinal properties, its use as an intoxicant was rare until the beginning of the twentieth century."

So its use as an intoxicant today should be illegal because it was historically rare, but its use as a medicine today should be illegal although it was historically widespread. Got it.

[Roscoe]

"Though cannabis was widely cultivated in America for three hundred years, both as a fiber resource and for its medicinal properties, its use as an intoxicant was rare until the beginning of the twentieth century."

So its use as an intoxicant today should be illegal because it was historically rare

No, there was just less percieved need for legislation when such use was rare. Today legal restrictions exist at the federal level and in all fifty states.

but its use as a medicine today should be illegal although it was historically widespread.

A lot of snake oil remedies have been rejected over the years. The AMA's position is that the sale and possession of marijuana should not be legalized.

Got it.

Not even close.