I have never smoked Marijuana, but I know plenty of people who have smoked it for years, decades, even, and they haven't turned into brain dead zombies - not even close.
It just makes sense to legalize Pot. For one thing, it would make a lot more room in the prisons for the real criminals. For another, we could tax the heck out of it just like we do cigarettes and gasoline. Think what that would do for state revenues.
It's only a matter of time,anyway, until most of the states will legalize it.