My old hometown newspaper used to regularly publish letters about chemtrails - they had a few nuts in town promoting it, and about every day there were letters in the newspaper. It was quite a farce. The main proponent even made a video and showed it on the public access channel. Sadly, my mother bought into the whole thing. I've pointed out to her that I've worked on aircraft with jet engines, and I've never, ever, seen any chemtrail apparatus, so she has to conclude either that I am lying to her and part of the coverup, or she is wrong. She was nonplused, yet I think she still believes it. oye.
A typical claim in the newspaper was along the lines of "i was driving along... looked up, saw an airplane, suddenly a chemtrail started to form, and instantly I felt a bad itching in my throat....took me a trip to the hospital and 3 days to recover..."
A rational person would write in about dispersal rates and how there is no way they could feel the effect of any chemical sprayed at 30,000 ft just seconds after it was released, and the typical response was along the lines of "I know what I experienced...blah, blah, blah".
There are not enough rolly eye smilies in the world to properly express my feelings on this subject.