Had an idea: Poison ivy donates a tree to every house in the city/state from the "St. Demeter Church". Probably half the people bring in the free tree and the other half put them out back The trees themselves are fine and pass all cursory checks, but as the month goes on, the trees continue to release pleasing pheromones, most assume good spirits and the like but after 30 days if inundation, people have become overly euphoric to the point of carefree birdering on carelessness and suicidal by accident.