I'd do this in a chronological order of its history, you can branch out on alot of the history
cant remember where and when it was first recorded to be used
etc
etc
example early 1900's proganda to get this illegal, and by who
etc
etc
1960's hippies, war
etc
1990's medical uses for glocoma many others in this time frame, also hemp shit too like mercedes using it in dash boards
2000's medical use for a million things now
this can be way more complex with many more sub cateogories this is just a suggestion on the route you can take, you can also show graphs on how much more paper can be supplied by an acre of hemp over wood cotton for clothing theres way too much but i'm just throwing ideas your way
I did a report in 1996 for 45 minutes on marijuana and this is w/o a decade more of shit lol
btw i dont smoke it anymore, will be drug free for 6yrs in november,