if you double bag it and duct tape it to your inside thigh/balls then you should be fine
when i was sixteen i wanted to take some to alaska (transfer in vancouver) so i went all out, i double bagged it nicely, then took the finger off a latex glove and put the bag in there, i tied the end and shoved the whole contraption up my ass, it hurt, ALOT but there were no problems except i really had to take a dump on the plane and i had to hold it in. (yes i know thats disgusting, but its better than going to prison form smuggling 1.5 g's)
however, if tyheres a big red 'S' on your boarding pass (or some other letter) that means that your going to get randomly searched, so go to the bathroom and ditch the weed