"The hard truth seems to be this: We live in a vast and awesome universe in which, daily, suns are made and worlds destroyed, where humanity clings to an obscure clod of rock. The significance of our lives and our fragile realm derives from our own wisdom and courage. We are the custodians of life’s meaning. We would prefer it to be otherwise, of course, but there is no compelling evidence for a cosmic Parent who will care for us and save us from ourselves. It is up to us."
Preeminent astrophysicist and cosmologist Carl Sagan not only smoked marijuana regularly, he was also a strong advocate for its use in enhancing intellectual pursuits — though not as publicly as others on this list. Having said that, Sagan did contribute an essay to the 1971 book titled “Marijuana Reconsidered” that spoke to the virtues of marijuana use. The piece was penned under the assumed name “Mr. X.” The identity of its true author was only revealed after Sagan’s death."
Artist: Jody Hewgill, Smithsonian.com