“R is very large for LSD (which I've never taken) and reasonably short for cannabis.”

— Carl Sagan

Essay as "Mr. X" (1969)
Context: I think the ratio, R, of the time to sense the dose taken to the time required to take an excessive dose is an important quantity. R is very large for LSD (which I've never taken) and reasonably short for cannabis. Small values of R should be one measure of the safety of psychedelic drugs. When cannabis is legalized, I hope to see this ratio as one of the parameters printed on the pack. I hope that time isn't too distant; the illegality of cannabis is outrageous, an impediment to full utilization of a drug which helps produce the serenity and insight, sensitivity and fellowship so desperately needed in this increasingly mad and dangerous world.

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American astrophysicist, cosmologist, author and science ed… 1934–1996

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“R is very large for LSD (which I've never taken) and reasonably short for cannabis.”

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