man that sucks. I kind of know how you feel except not half as extreme as that. Though those truth commercials are taking pot waaaay out of context for some people those things can exhibit some truths. Lets face it pot is awesome but its not necessarily for everyone(lord I can't believe I said that). Now I'm not saying to just up and quit for good because you can still enjoy pot and life at the same time. What I usually do is only smoke on Friday's and Saturday's and then I tell myself that I'm gonna not smoke pot work really hard and then come Friday I can reward myself with some nice bud. Of course this isn't gonna work for everyone but its important to at least find some moderation like maybe smoke every other day or only in the evenings instead of all day.

The very last thing about you saying your grades ruin your chances of ever going to college is total bullshit. This is why they invented community college so people who screw up can get back on their feet. So my first advice is to learn to use pot in moderations....and if that doesn't work than just try to quit it for good. Next step is to find a job. Now it doesn't have to be that super awesome contractor job but as long as it gets you some money then its good. Start saving as much as possible and then enroll yourself in a community college. Get the credits you need and the grades up by trying really hard and then transfer to real college and go from there.

Good way's to ween yourself from pot.....activities. Find a new hobby. Find some friends who don't smoke or better yet find a straight laced girlfriend. Anything to keep your mind off of it and you're straight. If none of those help perhaps using extreme measures such as getting your parents to randomly drug test you and threaten to kick you out of the house might be good. Fear can be a good motivator. I know it kept me in line for two years without pot. Really sucked but it paid off. Anyway you've heard all of this before so it probably won't help sorry dude.