anyway here take a look at this report its written by a PHd and though its pretty old it should still be look.
Weed facts/myths
a few things i said were wrong, pot smoke does have tar in it, and it is harmful. anyway take a look at some of the ideas presented in there.
it may be that if you buy some pot in brazil it was grown through rough labour and what not, and the money goes to big crime lords and what not. but that is not true world wide.
one interesting thing that i noticed in there was that marijuana smoke doesnt cause emphisema, unlike cigarette smoke. and one other good point that was brought up. you dont have to smoke weed to use it. doing things like baking it into muffins or using a water filler hucka, make doing weed, way less harmful then either achohol (because it doesnt distroy your kidneys and liver) and smoking cigarettes(cause using a water filter will greatly greatly reduce the effects of the carcinogens). it should also be pointed out that it hasnt been proven that marijuana causes cancer or anything, its only possible that it does.
overall marijuana is MUCH less harmful and addictive then things like meth/crack/or haroine, and therefore it shouldnt be classed among those. its better classed in the same league as alcohol and cigarettes, both of which could be considered more harmful cause they are more addictive, and both of which are legal.