Then the third angel sounded: And a great star fell from heaven, burning like a torch, and it fell on a third of the rivers and on the springs of water. The name of the star is Wormwood. A third of the waters became wormwood, and many men died from the water, because it was made bitter.
Revelation 8:10-11 NKJV
Drugs are a major tool for the demonic. Used to weed out the “undesirables”, those that don’t die (remember they want to significantly reduce the earth’s population ) can be easily controlled. It may also be a test drive, so to speak, for future biological warfare.