OK, I am pretty sure I figured out why Covid causes respiratory problems due to what I just experienced which caused difficulty breathing and a heaviness around the chest bone area. That perfume odor that hit me caused a headache, discombobulation, and fatigue but in addition it must of had chitin particulates because just clearing my throat and swallowing it caused phlegm to be lodged in the chest area causing shortness of breath. What actually happens is that the stomach also produces extra acid and tries to melt it down by sending acid up the esophagus. The acid increases and creates a substrate in the stomach and increased pressure as a defensive mechanism to push up and digest or to expel the chitin phlegm by vomiting. Maybe the perfume odor is to entice people to stay in a particular area for a longer duration or as a masking tactic for other combined toxins. But the definitely the covid symptoms are acid and chitin tainted phlegm lodging in the chest area because the body is protecting the internals from that going into the digestive tract and affecting vital organs. These scumbags have to confess and then hang.