I have seen them fall out of their chairs, run into walls, and laugh while looking at...whatever. I went to a not so great urban high school in Illinois. 932 in my Freshman class, 555 graduated. 2/3 of the casualties were marijuana and pregnancy or both. I smelled marijuana every day I went to school...EVERY day. I saw what became of the stoners...until I didn't see them any more at all.And you know, out of all the people I ever saw smoking weed, I never once saw someone get belligerent or aggressive in any way.
So I am going to go with what I have seen at high school and say a person is better off not smoking the stuff. Yes, same could be said about alcohol, just ask Johnny Manziel.