Although weed was never my thing, I have known a lot of people that act like they need it every day. A lot of people say that it is not addicting, but I have seen how obnoxious people can be when they don't have it daily. I tend to agree with the ad campaigns that say it probably won't kill you, and might not lead to worse drugs, but it definitely lowers your ambition. It is great that you are keeping up with your studies, and are able to forge ahead, but someday you might not. That is just food for thought.