A wrapper is light. A flood is not.

Carry your wrapper to a bin instead of dropping it on the street or into a drain.

One wrapper is very light. Four hundred wrappers are a monsoon plan nobody voted for.

Here's the science

What happensLitter and plastic dropped in streets and open drains
HowWaste blocks storm drains so water pools; discarded containers hold that water, where Aedes mosquitoes breed
SoWards with poor drain clearance tend to see more waterlogging and more mosquito-borne disease

Suggestive - measured in the real worldIN-WB

“Discarded household waste and water-holding containers were documented as principal larval habitats for dengue vectors in urban India.”

An observational link: littering rarely occurs apart from other sanitation gaps, so this shows association, not a clean cause-and-effect number.

And when we do it

Wrappers that reach a bin keep drains clear, so the water goes where it should when the rain comes.

You couldn't have known. Now you do.