This video mentions something most folks have no clue about... that Humans have a built in THC receptor and a built in thc LIKE producer.
For example dogs (there is a larger more active community for health and medicating dogs with pot
I myself will give my chihuhuhuhahuhauhauhua (shown in the avatar) a small 7-10ml of canna oil BUT only when she is REALLY bad and itchy we have taken her to vets to test her for the skin and they have never found the answer and just do what they do to anyone they cant help toss pills at em..
anyhow dogs dont get the same reaction as we do beacuse they do not have the thc recptors etc.. however they DO get the medicinal benefit and can suffer from the effects of thc when given too much.
He mentions he saw an article in 2004 but I am pretty sure there has been research on the effects and reactions from our receptors back in the 50's-60's