What is actually known about Musk's drug use? I heard he was on Ambien and he obviously smokes weed now and again, what else is our little genius hopped up on?

Edit: I have zero evidence for this but I can't see how Adderall or something similar is not involved. He's Aspie so its a little tricky to seperate that out but I dont know how anyone that "productive"/active isnt on something Xtra

Edit: by heard I meant Musk said it, whilst smoking on JRE