Marc Andreessen explains why he won't be jumping on Silicon Valley's ayahuasca trend

Marc Andreessen, one of Silicon Valley's most outspoken executives, says he's seen top bosses leave their companies and become surf instructors after taking drugs.

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• Marc Andreessen said he's not interested in taking psychedelics — even as other executives recommend ayahuasca.
• He says he's seen tech leaders use the drugs and "move to Indonesia and become a surf instructor."
• Instead, Andreessen said he uses another drug that once made his heart skip every 10th beat.