I know of alot of people who can function normally and be a stoner and have done so for decades. The difference between the people who can and the people who can't is the fact that the type that do suceed at this have a dream or many dreams to achieve while the other is still trying to figure out what their dream is. Just have a goal that you want so bad that you won't jeopardize it because of pot. Priorities also come into play, too. I'm a mom, a wife, I'm holding a job (crappy, but it works for the time being)and I'm trying my hardest to get myself into my dream home.