Why didn't the brownies work for him?

So yesterday I decided to make some edibles. I made the cannabutter and used it in the batch of brownies. I also used 8 grams for 12 brownies. Last time I used 7 and they turned out really good. I ate two and they kicked my a**, my other friend ate one and that worked for her.. And while one of my other friends ate 3 1/2, it didn't work, so he smoked a few joints. So how come it worked for us instead of him? Oh the marijuana I used was really highend stuff.

everyones tollerence is different

yeah the medibles are a hard thing for some folks. could have been other reasons why it does not work.
I have found this works the best for me.
do not eat 3 hours b4 a edible
then after 1 -2 hours after eating the edible eat something small like a couple oreo's or something kinda small this for some reason (perhaps it's my slow metabolism or something but that helps) also other factors which MAY hinder the edible are if the person uses narcotics' ( have notice myself not being able to get a "BUZZ" like most folks.

pretty much what gioua said.