You could claim that laziness promotes cannabis :D . I think many researchers try to find correlation between things and when they do, they consider it a fact. This is because somehow in their minds , they have already a predetermined result in their mind and try to find a way to prove it, something like reverse engineering.

I am not saying that they are wrong, i am just saying sometimes we,people, are too eager to prove something and try to grasp on something that would prove us right.