The Havana Cindrum, a Chemical Reaction?

Some suggest the havana cindrum may be linked to chemicals used in pesticides, insecticides. Others wonder if the cuban government is using some sort of weapon on us personnel. It's no secret that the us and cuba have had a strained and strange relationship for decades. But because these events are so close, some wonder if cuba is actually collecting intelligence on the us. For russia, which might give people headaches.