Elon Musk has apologized for lighting up with Joe Rogan on the podcaster's show back in 2018.

The SpaceX founder said sorry for smoking weed with Rogan in an internal email to the company obtained by The Washington Post, telling employees that “it was not wise” to smoke with the host. He affirmed that the company "maintains a drug-free workplace.”

Musk also warned his employees that they shouldn't make the same mistake he did, even though smoking pot is legal in California. “SpaceX personnel may not use or possess any controlled substance while in the workplace, and also may not be under the influence of legal or illegal drugs while at work,” Musk said in the email. “Anyone who appears to be inebriated or under the influence while at work is subject to drug testing and potentially other employment actions.”

The entire episode led to extensive reviews of workplace safety at both SpaceX and Boeing back in 2018. NASA’s administrator Jim Bridenstine said, “If I see something that’s inappropriate, the key concern to me is what is the culture that led to that inappropriateness and is NASA involved in that. As an agency, we’re not just leading ourselves, but our contractors as well. We need to show the American public that when we put an astronaut on a rocket, they’ll be safe."

Musk is probably still smoking here and there. Back in March, he dropped a single titled "RIP Harambe" on his page, Emo G Records. Plus, remember his infamous 420 tweet?