Elon Musk Has Used Illegal Drugs, Worrying Leaders at Tesla and SpaceX

Elon Musk and his supporters offer several explanations for his contrarian views, unfiltered speech and provocative antics. They’re an expression of his creativity. Or the result of his mental-health challenges. Or fallout from his stress, or sleep deprivation.

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.