Sorely afflicted by a famous (?) defoliant lovingly named "Agent Orange", I tend to stay away from herbicides, etc. Which is kinda difficult for a wetlands and wildlife biologist.
But I didn't always know about the AO.
Seems the defoliant dripped off the trees and such, and eventually washed into the Tonkin Gulf. Navy ships distill freshwater from saltwater, but did not remove the defoliant. So daily, we drank, and showered in the damn stuff.
2008, I got sidelined by severe spinal problems and two heart attacks. No more 2-week field trips in swamps, forests, and jungles. Still miss that that to this day!
On a wildlife survey in the Amazon, I camped solo for three weeks. There had been a sloth in the trees above my campsite, and after the third day, she came down and met me. Did you know they descend to go potty? She also came down to watch me every morning. Very good, fast swimmer!
So, I miss all that.
In 2018 I started going to the VA. They discovered the heart attacks, and found a hole in my left atrium - fixed all in a long open-heart procedure. And my neurologist diagnosed me as an Agent Orange patient. Dang stuff has my neuro system, joints, and pulmonary all fouled up. And every sailor aboard that carrier has been approved for disability ratings.
So no permithrin, etc., for me. A light dusting of "Off", and a good search for ticks.