Replying to What has led to the bias against weed?

I'm writing a paper for a psychology class regarding the raging bias against weed that the many Americans have developed. I'm not a frequent smoker, as it's hard to come by where I live... but I have become outraged by some of the bullshit that my family and teachers have been spewing about the "deadly gateway drug".

Living in Wisconsin has over-exposed me to the horrors of alcoholics and drunk drivers, which have killed/disabled a couple of my friends' family members. The fact that Alcohol is accepted and is such a big part of social gatherings, yet marijuana is shunned like it is destroying the world... is hard to accept. It's very interesting how people's minds have been altered to think backwards.

Interested in what you guys think started this big uprising against the devil's lettuce throughout history. I know media influence and lack of education are huuuge factors... but how did it all start?