I read a novel, "Red Winter, White Snow", self published espionage fiction book and the plot was our adversaries pouring drugs into the US to undermine us. That book is from cerca 2001, so a different set of drugs but the scenario is still valid.
The authors certainly did not come up with this idea, it has been put forth many times.... drugs, mainly illegal, can undermine us, maybe in parts of the nation, it has. The book I read was more about what the crack cocaine epidemic was about.