You’re wrong. There is a sweet spot for growing opium in Mexico for growing the opium producing poppy and the drug cartels in Mexico have moved into it.
https://news.vice.com/article/mexican-heroin-the-destruction-starts-in-the-poppy-fields
From the world atlas.
Land Area Devoted To Cultivating Illicit Opium Poppies
1 Afghanistan 225,000 hectares
2 Myanmar 58,000 hectares
3 Mexico 15,000 hectares
4 India 12,250 hectares
5 Laos 6,200 hectares
6 Pakistan 2,300 hectares
7 Colombia 298 hectares
8 Iran 100 hectares