So long as he acknowledges that these effects are temporary and not permanent unless done during pregnancy or as a minor then he'll still have my support.
Who left the fridge open?
People who drink all the time, based on what I've seen in life, tend to be dumber and have less ambition as well. Does that mean I'm stating that anyone who has ever drank, or even who drinks somewhat regularly, are all dumb or lacking ambition? No. It's based around those individuals who use the vast majority of their free time to boozing it up, and who shirk their non-free time responsibilities to get some boozing in as well.
I've known quite a bit of functional pot users who smoke occasionally or even somewhat routinely. I've not known a single pot head, the types that between every class at college and every evening after work (if they actually went, instead of staying in to smoke and screw around), who tokes up every moment they can possibly do it, that I'd consider rather sharp witted or ambitious. I've known some that were like that during college and high school that have since stopped, and became more occasional users, that absolutely seem significantly more intelligent in their day to day actions and far more dependable and driven.
I don't really see anything outlandish with what he said, unless someone ridiculously wants to act like he said words other than those he ACTUALLY said.