I'm not going to argue that the United States does not have a healthy appetite for drugs.
However, the demand for traditional stimulants, heroin, cocaine, etc. has held steady or declined for the last decade here. And the demand for opioids is also declining. Meanwhile, your neighbors in Uruguay have the highest per-capita increase in narcotic use globally.
In addition, Australia/New Zealand and Western Europe dominate the MDMA/Hallucinogen market. And Asian dominates the heroin market (particularly Iran/Iraq).
I know it's convenient to use the US as a scapegoat for drug problems. But on a percentage basis the US is no longer the total globally leader (that's Russia). And when you divvy up by category we're only leading cannabis, opioid, and meth use, however meth is rapidly growing elsewhere and South America, Africa and eastern Europe will soon out pace us.