Of course marijuana can be legalized. Marijuana is a plant grown for the ground that can be used for a multitude of purposes. Can you imagine a world where a proprietor of marijuana no longer goes to jail and you start to see prison populations decrease? Can you imagine a world where people aren't lied to about a plants effects?
Marijuana has been illegal for too long and it is about time it becomes legal. Of course it can be brought into the mainstream. Alcohol gives one a high and it has been legal for years; in fact, trying to prohibit it just made it that much more desirable and the same is probably true for pot.