Booze Zombie said:
It makes you high and because it's illegal you get paranoid about the cops, also you get "the munchies".
No, it actually has a tangible effect of making you paranoid. After smoking on a regular basis for two years I find that marijuana tends to make me paranoid of certain social situations and has a very negative effect on my emotions, so I've cut WAY down on my usage.
And I haven't read much of the thread yet, but you can't just say "it gets you high", that's like telling someone that having sex will make you climax - OK, wtf does that mean?
Getting high seems to lead to this:
ENHANCED TEXTURAL SENSATIONS (more visceral appreciation of complex images and sounds - think psychedelic movies and music - some hard-rock music can become truly holographic sounding - touching kissing and fucking are also enhanced

)
MORE INTROSPECTIVE FOCUS (instead of worrying about your appearance, you'll think about and say whatever you feel like - and you won't worry so much about your appearance unless you get the notion that you'll get busted :x)
LETHARGY (it's a depressant, which is why most stoners prefer sitting on the couch watching movies or playing video games, rather than playing basketball or tag or other fun active things - also weed is a great sleep aid)
ENHANCED IMAGININGS (you'll be more open to suspending your disbelief which will lead to more creative ideas and greater immersion in movies and video games - getting high and playing an FPS can, like,
really TAKE you there, MAAAAAAAAN...)
HUNGER (since all your senses are enhanced, things will taste better, plus you'll crave high-carb foods - I think this is because your brain is more active and your body is trying to make you fuel it, although often you'll get carb-loaded and become EVEN MORE LETHARGIC and it will have the opposite effect)
Long term effects - the worst one is the effect it has on your dopamine receivers. It clogs them up with excess protein, which will contribute to mounting depression (happened to me, quiting smoking for a couple weeks made a HUGE difference) To be clear, I used to smoke two or three times a day every day. Now I smoke one night once every week or so. Like anything else, too much isn't good for you.