People in social groups that routinely use drugs tend to over estimate their prevalence in society at large. Even weed is below 50% lifetime use and 20% monthly use for 12th graders.
I'd argue fortnite is a bigger part of youth culture than opiates.
What percent do you think play Fortnite?
As for Fortnite share- there are ~76 million unique fortnite players in a month and supposedly 40-60% of them are between 18-24. I'm going to go with the low number. I have no good data on Fortnite play by country other than its popular in the USA and parts of Europe, but not in Asia, so I'll just say that 1/6 of the players live in the USA (again, probably pretty conservative). There are roughly 25 million 18-24 year olds in the US. So we get 76M*.4/6 = 5M for the number of monthly US fortnite players in the US, or roughly 20% of the population in question.
A lot more than opioid users, roughly the same as reported marijuana use, and a lot less than alcohol use.
>The monetary cost of U.S. domestic drug policy is equally remarkable. Since the War on Drugs began more than 40 years ago, the U.S. government has spent more than $1 trillion on interdiction policies. Spending on the war continues to cost U.S. taxpayers more than $51 billion annually
That is $1T to polices, contractors, private prisons, prison guard unions and so on. It is an economy in itself.
Here is plenty of information on the topic.
https://www.cato.org/publications/policy-analysis/four-decad...