Wall Street Journal hit piece, 2024-01-06:

(Click image to read full text liberated from paywall by archive.is.)
In recent years, some executives and board members at his companies and others close to the billionaire have developed a persistent concern that there is another component driving his behavior: his use of drugs.
And they fear the Tesla]and SpaceX chief executive’s drug use could have major consequences not just for his health, but also the six companies and billions in assets he oversees, according to people familiar with Musk and the companies.
The world’s wealthiest person has used LSD, cocaine, ecstasy and psychedelic mushrooms, often at private parties around the world, where attendees sign nondisclosure agreements or give up their phones to enter, according to people who have witnessed his drug use and others with knowledge of it. Musk has previously smoked marijuana in public and has said he has a prescription for the psychedelic-like ketamine.
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In 2023, The Wall Street Journal reported that Elon Musk microdoses ketamine for depression and also takes full doses at parties. Following publication of the article, Musk tweeted that ketamine is a better way to deal with depression compared with more widely prescribed antidepressants that are “zombifying” people.