For abuse/dependence on illicit drugs only.
further down the page listed numbers, which indicated over 21 million Americans had substance abuse issues.
For both alcohol and illicit drugs.
The number for illicit drugs is 5 million, which divided by 1.9% gives a total 12-and-older population of 260 million.
Correct and which also means over 8% of Americans over age 12 suffer from the disease of substance abuse regardless of the substance - a huge number given that gays are something like 1-4%, Blacks 12%, Hispanics 14% (again, I don’t claim to have the exact census percentages - I only use the numbers for rough correlations.)