Elon Musk smokes marijuana with Joe Rogan during live interview

"As a result, this caused me to reconsider my future".

Morton, who is walking away from a $350,000 base salary and a $10 million new-hire stock grant that would vest over four years, said he believed "strongly" in Tesla and that he had no disagreements with the company's leadership or its financial reporting.

Gaby Toledano, Tesla's head of human resources, also said she was leaving the company on Friday.

Elon Musk, the billionaire chief executive of Tesla, risked provoking fresh concern from investors on Friday after smoking marijuana on a live web show with United States comedian Joe Rogan. While he said he was "not a regular smoker of weed", he took a drag from what Rogan described as a joint containing tobacco mixed with marijuana, which is legal in California. This is all bad news if you work for one of Elon Musk's companies or care about him as a person. Guardado alleged that Musk and Tesla use a "vague" druge use policy to target and punish employees who are seen as a "threat".

"Tesla stock drops 9% because [Eelon Musk] smoked some pot on a podcast. good lord, when are people gonna drop the stigma", one person said.

In July he shocked investors by announcing on Twitter that he had funding secured to take his vehicle firm Tesla private. Shares of the carmaker fell 1.4 percent in trading before USA exchanges opened.

Elon Musk should invent something that keeps his mouth shut.

Denning took aim at Musk's Thursday appearance on the Joe Rogan podcast, which included a segment in which Musk sounded more like a high college student than the CEO of a massive tech conglomerate.

Musk's representative didn't immediately respond to a request for comment.

"I got text messages from friends asking, 'What the hell are you doing smoking weed?'" Musk said on air.

Shortly after Rogan lights the blunt, Musk asks "So is that a joint?"

Prices of Tesla's only unsecured bond, a $1.8 billion note issued last August with a 5.3% coupon, have fallen since Mr. Musk first tweeted his interest in a go-private transaction last month.

Moody's Investor Service downgraded the company's debt to "junk" status earlier this year.

Musk in recent days also renewed a feud with a British cave diver, Vernon Unsworth, who was involved in the rescue of 12 boys trapped in an underwater cave in Thailand this summer, according to the BBC. "Although the majority of shareholders I spoke to said they would remain with Tesla if we went private, the sentiment, in a nutshell, was 'please don't do this'".

When The New York Times asked Musk if he was smoking when he made the tweet, Musk replied, "Weed is not helpful for productivity".