This is no smoking gun. This is chasing the wind. Folks are always looking for some factor "out there", the tweaking of which will (they hope) eliminate the ill effects of bad individual and societal choices. The only smoking gun is a perversion of thought and lack of personal responsiblity.
Who is the most promiscuous? The wildest, most blindly hedonistic ones.
Who will do the most of any kind of drug? The wildest, most blindly hedonistic ones.
One doesn't cause the other, they are both caused by a third thig: wild, blind hedonism.