Hey, I really think you made a good point there and your post is nicely written but uhm how do I say that xD
I don't really think that chemtrails are real. For me this looks like a normal cloud formation. Have you ever heard of the german saying: "Der Glaube versetzt bekanntlich Berge" (If you believe you can move mountains). Maybe your boyfriend is coughing harder because he believes so much in chemtrails and the harm that they do, that you know his body physically reacts to him. It is also proven that the strong believe in something can have an effect on the physical world.
I would be very interested in discussing this topic with you!

Regards