The link between drugs and terrorism

The illicit drug trade is a primary source of funding for terrorists and extremist groups. Afghanistan accounts for 75% of heroin production and is host to two-thirds of the world's lands illegally used for the cultivation of opium poppy, namely in the Nangarhar province. Levels of production and trafficking have increased 1000% since 2001. (https://journal-neo.org/2018/05/18/the-longer-washington-stays-in-the-more-drugs-fly-out-of-afghanistan/) (look for other sources)