Thing is studies done in the past probably mean nothing today. There's a difference between a plant growing in a ditch in India or Afghanistan versus a plant manipulated by some Hong Kong wide boy in a London garage. Messing with THC levels, enhanced growing techniques, cross breeding etc and we have something very different from days gone by. Studies just can't be done on all of them. As for trusting the legal legit stuff in the States yeah that sounds fine. They must be way more trustworthy than our farmers who fed their cattle bone meal made from...cattle. Yeah they turned their precious herbivores into cannibals, which led to the Mad Cow disease. And we ate it being the trusting sorts which lead to variant CJD. Well I didn't. I was eating German beef fed on...grass. Old skool eh? I might be wrong but it seems to me the days of cannabis being a well known and understood 'thing' for the consumer, are over.