I agree that humans have always used drugs. Still I contend that music has an influence on drug use. In the 60s it influenced people to experiment with psychedelics. In the 80s it encourages coke use. In the 90s a 40 and a blunt was all we wanted. In the 2000s it was E. In 2010s it’s lean.
There's no question about this, especially as it relates to lean specifically. The lionshare of the blame, in my opinion for the widespread popularization of lean belongs to Lil Wayne and with a dishonorable mention of Future in second place.