Why is Cannabis illegal in most areas? (Backed up with points for and against)?

Oh wow man.... Why is indeed the question. The rightous herb should definitely be legalized man. Marijuana so mellows a person's head out man and puts a person in a whole new state of spirituality. Marijuana like adds a whole new dimension to the cosmos dude and puts a person into a transcendental state of mellowness that makes a person..... LOL, what was the question dude?