I've also met some extremely productive weed smokers. It seems like most people become lulled into a hazey life, but there are these idiosyncratic responders who smoke copious amounts and are fully on top of their game.
I think it's equally possible that lazy people who smoke will be lazy and people who are active and always doing stuff will continue to do that even if they smoke. The temptation to be lazy might be greater for the few hours they're high, but not everyone will give into that every time and every other hour of the day they're doing what they'd normally do.
