I watched a show on the history channel about drugs and stuff and it talked about why marijuana became illegal. It was saying in the 1930s or sometime around then a lot of Mexican immigrants were coming over and they all smoked this stuff which was marijuana. They made it illegal cause they were trying to find a way to bust all these immigrants for stuff. So pretty much marijuana became illegal because the government wanted to be racial and prejudice. I dont remember all of the details but that was pretty much the gist of it.