Kinda reminds me of a guy I used to work with, yes this guy did work. ha!My old boyfriend was that way. He smoked weed like a 4 pack a day smoker smoked cigarettes. I have no clue how he functioned or kept a job. Oh wait! He didn't! That's what he had me for! Seriously, though, he was the single most intelligent man I have ever known. Couldn't keep a job to save his soul. Put him through the avionics classes out at the airport. He did so well that he had a half-dozen job offers before the last semester even started. Went for second interviews for each of them. Got serious letters and dollar and benefit offers from each of them. Never went any further. Know why? Couldn't pass the piss test to save his soul. Last I heard he'd married some gal in Texas and she was supported him. I kinda felt bad for her but he's her problem now.
But when I started working part time in a machine shop when I was in high school this was the guy that ran the multi-spindle screw machines. These were Swiss designed and pretty complicated ancient WW2 surplus machines and very finicky because they were basically worn out. This guy was stoned 98% of his waking moments. When he was out of money and weed he couldn't tie his shoes, but if he was stoned he could keep those things singing and he was the only one in the building that could.