Anagrammatic orientation.

Have you ever seen such a sight?
A lake, a pond, small and slight.
Eenie-meenie-miney-mo,
Topick the one that''''''''s got to go
(a Darwinian perspective.)

Half the answer to any question you pose to ask, slung backwards.

A mixed up file.
Take a puff.
One is never quite enough,
always coming back for more.

I scar and scare and burn the eyes.
Now riddlers, riddle me this:
What am I?