Watch the movie Reefer Madness that was a propaganda film to make marijuana illegal.
Today however that movie is considered to be more of a comedy.In the 30s all they did was spread lies like how smoking marijuana causes black people to play the devils music or that your going to rape women. They basically said if you smoke pot then you have no future.
If they you won't have a future if you smoke pot then why do we have so many successful pot heads.
How about how they determined how marijuana kills brain cells?
http://www.youtube.com/watch?v=JRrQWIX2QcA
Or the most nidicolous lie is how they say marijuana is a gateway drug.
They also say if you smoke pot you will get cancer when there hasn't been one documented case of cancer caused by only smoking pot.
What about this?
http://www.youtube.com/watch?v=I5_AIoQDVvg
Or this fast forward to after 1:45 because they show the video I already posted about how the determined marijuana kills brain cells by suffocating monkeys
http://www.youtube.com/watch?v=7jlIk8HIgJc&feature=related