Engine

I assume you're talking about Sagan's Cosmos series?
Interestingly Sagan was a smoker and was personally active in the anti-prohibition movement. Cosmos is an excellent watch regardless of your intoxication choices because, as duga mentioned, Sagan was a genius who was able to communicate his ideas easily with us lesser beings.

Also, I'm not sure if he gets high but the current leading genius, Neil Degrasse Tyson, has an essential radio show and podcast (StarTalk) for anyone interested in astrophysics and such.

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Like an arrow,
I was only passing through.