First, I will make this clear: I'm for legalising it.
HOWEVER, my feelings are a tad... paradoxical. I often hear it being argued that you can't get addicted to weed and that there's no evidence of it doing anything to you mentally. Well, I've smoked it for years, and many of my friends have too. It can change people. I know that people who get that image in their head of the lazy stoner who doesn't do anything worthwhile with his time are only thinking of a stereotype... but I've seen that happen. Some peoples' wills just.. weaken, and now in my eyes they're alive, but don't really have lives (if you get my meaning). And yet, they kept smoking it, and still do. That, to me, is flat out addiction.
It changed me a little too, over the years. I got quieter, less social, kind of lazier, but not in the way you may think. My interests stayed the same, but while before I may have put a bit of effort into school, my effort became virtually nil. However, I can put in plenty of effort into something if I'm actually INTERESTED in it (so maybe you'd attribute the school thing more to how crap standardised tests are than to weed smoking).
Anyway, I did say I think it should be legal (mainly for reasons already stated here in other posts, so I won't get into that), but I would REALLY like the REAL dangers of it made more obvious: the bullshit propaganda discarded, and the possible harm brought to greater attention. Whenever there's a media report on this subject, I'm sceptical to say the least. The exaggerations can come close to being flat-out lies, and if proper scientific evidence isn't mentioned with points for and against a theory regarding weed's effect on the body & mind, I'm plain not interested.