Elon Musk interview on Joe Rogan last which made their shares drop 8% for the day because he took one puff. Everyone went berserk because you are not supposed to do something like that if you are the CEO of a large company. The stock dropped because the CAO departed less than a month after starting at Telsa. Not because of the puff of marijuana.
I don’t think that’s actually true though it’s been repeated a lot - people have left without that large of a crash (and in this case it looks like they joined to help with going private so it’s not a huge surprise they left). The fast crashes seem more related to stupid media freak outs - similar to FB and the Cambridge Analytica thing.
Tesla's finances are a perenial source of concern and if Tesla's chief accounting officer leaves the company in the middle of another row regarding Tesla's financial health, I really doubt a puff is capable of raising more concerns.