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Shares of electric vehicle maker Tesla Inc. fell more than 6 percent early Friday after the CEO appeared to smoke marijuana during an interview and the company's accounting chief left after a month on the job.

On Friday, Tesla revealed that its chief accounting officer Dave Morton had resigned after less than a month in charge, citing the intense "public attention" on the company.

"Defendant Musk artificially manipulated the price of Tesla securities with objectively false tweets in order to "burn" the company's short-sellers", Left said, stressing that Musk's actions violated federal securities laws. Morton had only been on the job for a month, and joined Tesla from harddrive company Seagate.

He has denied he was smoking weed when he sent his now infamous tweet on August 7 claiming he had secured funding to take Tesla private. Investors in the electric carmaker are on edge after a tumultuous August, during which Musk proposed and then abruptly pulled the plug on a go-private deal.

At one point, Musk described the constant barrage of ideas in his mind as being "like a "never-ending explosion", and said he wondered as a young boy whether he might be insane because it didn't seem to happen to other people. We think this is further evidence that the time is now for management and the Board to address these issues", Albertine said.

A screengrab of Tesla boss Elon Musk smoking marijuana.

Executive changes at Tesla are closely watched, and this one was made especially notable by the more-than-boilerplate statement in the filing, attributed to Morton.

Musk explained that he's "not a regular smoker of weed" because he "doesn't find it's very good for productivity".

In a recent New York Timers interview, Musk did admit to using the prescription drug Ambien to help him sleep.

Joe Rogan Experience/YouTubeElon Musk taking a toke.

Outside of the reefer madness, the duo chatted about everything from China to humanity to artificial intelligence in the two-and-a-half-hour podcast.

Mr Unsworth, from St Albans in Hertfordshire, is now reportedly planning to sue Musk for what his lawyer called his "ongoing campaign of publishing vile and false accusations".