Ahh, but functional at what? Many people will functionally make use of marijuana throughout the day doing say, restaurant work, and if anything, will function

Ahh, but functional at what? Many people will functionally make use of marijuana throughout the day doing say, restaurant work, and if anything, will function better (YOU try putting up with hangry customers all day without something to take the edge off). But bring that habit into another role where speed and precision are important and the amount of people who can excel starts to dwindle.