Why is marijuana illegal?

Because it's harmful effects on the body are well documented and laws were passed to keep persons using the drug from harming themselves and others while under the influence.

To the children who has already posted:
Hemp itself is not illegal, just the hallucinogenic specie.
Don't believe in every conspiracy theory, in fact don't believe in any.
How many of you on here are white, suburban junkies?
I'm sure if the gov't wanted to tax it, they'd find a way.
because its an intoxicant


Answers:
Christina F is correct , that's how it started , now there are several reasons, Thank the Hippie culture for the latest round of hatred for marijuana. best argument for legalization can be found at leap.cc (law enforcement against probation) don't forget the religious right (AKA -the Cristian Taliban) that has a huge influence on gov. and does its best to make all Americans live by their religious beliefs. ( sound failure?) baby stomper ' Never done drugs because I had the willpower and good sense taught by my excellent parents ' > thats great but its youre body and you made a good decision but you cannot legislate morality and tell others how to treat their bodys. you dont have to like it but you do need to respect the choices others CHOOSE to do, also have fun in sunday school!
because our lawmakers are a buch of killjoys
Primarily because a bunch of Jackass' classified it as a drug so they could wage war on average citizens (called war on drugs)
by the way
That war is going miserably too
Because Dow Chemical in the thirties discovered how to create synthetics from petroleum, synthetics that could replace the job of hemp. Lobby Congress to make it illegal, then the US will have to buy the new synthetics. The plan worked.
cause its good and gov't hates us
because people get high and do stupid things like drive then wreck
It was originally made illegal in order to legally discriminate against Mexican imigrants and African Americans. It's still illegal because the government can't tax it.

You should rent the movie Grass. It's really informative.

And to Petey above me: SO IS ALCOHOL!! DUH!!
The U.S. Government probably can't figure out how to tax it properly or it would be legal. They know they can charge the people buying it hear a tax to buy it , as we pay huge prices for cigarrettes. They are not sure how they will tax the drug cartels that supply it . LOL. Can you imagine the IRS sending a delinquent tax notice to one of those bad guys ? I have heard that there is some marijuana being allowed for purchase if it is for medical reasons in some places. i am not sure of the details. in those cases it is said to be legal but i am not completely sure if it is or not. This might be a good question to ask Hillary Clinton. I hear she reads/uses FreeLawAnswer.com . I know that her hubby tried it / but never inhaled it :-)
It is illegal because laws banning it have been passed by our elected representatives in government. Why do you think anything is illegal?
It is said to be a gateway drug, but I don't see the logic in that. I would say it is because the government is unable to profit and control it at this time.