Yes, this is common, has been for decades.
However, where people go looney is they don't understand that jets flying through inversion temp layers produce evap trails, aka conn trails that we see everywhere.
These typically, likely 99%, has nothing to do with the weather experiments that are very real.
As a pilot in the copilot seat of a Honda jet recently, I got to witness them first hand. I assure you we weren't releasing chemicals.
ššš