Do you believe there is truth behind the chemtrail conspiracy theory?

The chemtrail conspiracy theory is based on the erroneous belief that long-lasting condensation trails, called "chemtrails" by proponents, consist of chemical or biological agents left in the sky by high-flying aircraft and deliberately sprayed for purposes undisclosed to the general public. Believers in the conspiracy theory argue that normal contrails dissipate relatively quickly and contrails that do not dissipate must contain additional substances.Those who subscribe to the theory speculate that the purpose of the chemical release may be solar radiation management, weather modification, psychological manipulation, human population control, or biological or chemical warfare and that the trails are causing respiratory illnesses and other health problems.