I've often wondered if those programs would eventually lead to widespread allergies developing among the population due to the rapid increase in a single kind o

I've often wondered if those programs would eventually lead to widespread allergies developing among the population due to the rapid increase in a single kind of pollen, like Japanese hay fever: https://en.wikipedia.org/wiki/Hay_fever_in_Japan https://en.wikipedia.org/wiki/Hay_fever_in_Japan