It is no coincidence in my opinion that we have no snow/winter this year at the same time they have been criss crossing our skies with these things. These contrails started after the "Canadian Forest Fires". When was the last time you saw cumulous clouds?..or a vibrantly blue sky? Would be nice to know what they are all about - 1) make us sick like you say, 2) change our weather patterns?, 3) contaminate fields with aluminum chaff, 4) reflect sunlight for the climate zealots, 5) military defenses of big cities from some sort of attack (we are setting up for war if no one has noticed)?. 6) some sort of project blue beam alien attack that needs particles in the air to project holograms? It is no conspiracy that these low altitude contrails are happening...our eyes don't lie....the question is why without being a conspiracy theorist?