I have seen the same study I believe that it is believed that the "Super Weed" that everyone smokes today lowers men testosterone. I am not a scientist but it is worth looking into. My thoughts are marijuana in its natural state meaning marijuana that is found growing in the wild male and female plants is the healthiest form of marijuana. It is when "man" puts his dirty little fingers on it and grow it in an un-natural way ie in a closet or lab separating it from the male plants and manipulating its THC content is when degradation begins.