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Investors worry about Elon Musk’s drug use. He doesn’t.

The Tesla chief made his first public appearance since ending an attempt to take the carmaker private. Overnight, during nearly three hours live on “The Joe Rogan Experience,” a popular podcast, he mused on A.I. and contemplated the end of the universe. He also drank whiskey and took a drag from a tobacco-and-marijuana joint. (He was in California, so that was legal.)

Mr. Musk probably won’t have allayed investor concerns about his behavior. “I got text messages from friends asking, ‘What the hell are you doing smoking weed?’” he told Mr. Rogan during the show.

In fact, he may have raised more questions. One, given that he says he sometimes works 120 hours a week, is where he found the time to make this appearance.

Mr. Musk, who has talked before about using Ambien to sleep, was also asked what keeps him up at night. “It’s hard to run companies, especially car companies,” he replied. “It’s very difficult to keep a car company alive.” He has told the NYT that the task can be “excruciating.” Stunts like this may not ease the pressure.