Hmm, CJ. You should look into the history of it then. Before it was 'outlawed' in the 10's-30's it was prescribed medicinally for 50-60 ailments. When it was banned, it *suddenly* was found to have no medical benefits and was even tied to ridiculous things like Mexican over-immigration. Hypocrites. If you want a positive angle to push, look towards the life-giving benefits it gives to aids and cancer patients: there is your best bet for its redemption. keep up the good fight. 
/hey, if gandhi smoked it, how bad can it be?
Yeah, I've read about that. It was in about 90% of all medications in that time frame. You're right about it being tied to mexican over immigration, but it was tied to the black blues/jazz culture that loved doing it. I think reefer was first bought to the new land by indentured indian servants, who now compromise the nations of Guyana and Trinidad and Tabago.
Most of the strains these days are indicas with roots along the himalayan belt, where the plant originated from. They're afghani plants brought back by hippies and bred by growers for increased potency. It's something of a 80/20 mix. Mostly indicas, but some sativas bred in for that psychoactive feeling. Pure stivas give different highs but they're impossible to come by. Most of the sativas bred into today's premium street stuff has roots in Colombia, South India, Thialand, Combodia and even Africa.
Cannabis was a highly traded plant.. The arabs, persians introduced it to the other continents where the respective cultures bred their own unique strains. However, many of them today are extinct. Most of the weed we smoke today is from a very limited genepool.
The guy below is named Neville. He bred some of the first commercial strains that compromise what we smoke today. Took some of hippe bred strains, colombian shit and worked his magic. He is not known by most, but he's a very important figure in modern street weed.