As we gaze upon the Cosmos, let's remember Carl Sagan, the famed astronomer who attributed his most powerful epiphanies to the creative influence of cannabis. And his best bud Dr. Lester Grinspoon, who set out to make the definitive scientific case against weed and ended up becoming one of the plant's greatest champions.

Their friendship truly changed the course of weed history, with some incredible stories along the way.

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