Hum, If we hypothesize that drugs abuse could be ruled in part by genetics (some people are more prone to became addict than other), then the drug epidemics from 70's, 80's and 90's should had pruned a lot of this genes from the population.
The current teen not doing drugs are mostly the sons of the former teen not being killed by drugs on its 20's (because they didn't do drugs, or were able to quit drugs before it was too late).
I wonder if an effect of the Fentanyl epidemic could be traced in the genetic makeup of the future USA population, when the children of all the young that died (obviously) never appear in the population pyramid.
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