Actually, you aren’t correct. About 96% of the worlds non-pharmaceutical opium crop comes from Afghanistan. Mexico isn’t even close.
Actually, no I am not wrong.
As far as the U.S. heroin use is it does not matter which country produces the most, it’s FROM WHICH COUNTRY does heroin in the U.S. arrive. It has been increasingly coming from Mexico, and growing there is increasing as well.
https://www.bloomberg.com/news/articles/2017-03-03/america-s-heroin-epidemic-starts-in-mexico