This has always shocked me.
Hell, I smoke pot like on Friday night and Sunday during the day (2 times a week) and even that shit slowed me the fuck down/made me retarded.
The thought of anyone smoking daily would essentially mean they are burnt out 24/7 and pretty much become a vegetable.
For me, it usually takes 2-3 days after getting high to feel clear headed.
Just the idea of myself smoking weed everyday scares the shit out of me and I would be curious as to what my brain would feel like after a year or two of doing that.