I think it's been made pretty clear, international drug smuggling is basically a bad idea.
If you do decide to do it, think about the best and worst case scenarios and work out whether it's work the risk- best case scenario, you save about $30 on weed (I dunno how much an eighth costs in the states, is that about right), worst case scenario, you get caught, and your life is literally fucked. Not like 'OMG! I failed high school' fucked, but really, just totally destroyed.
No, its not actually that likely you will get caught, really, for all the technology and sniffer dogs and whatnot, people still bring through drugs all the time, but seriously, it's just not worth it.