Answer:
I am the ultimate killing machine used not once but TWICE I can be made by humans.
I have an eye but am blind, a sea, but no water; a bee, but no honey; tea but no coffee; and a why, but no answer. What am I?
From house to house I go, sometimes narrow, sometimes wide. Whether there's rain or snow, I always stay outside. What am I?
I am owned by the poor the rich does not need me. If you eat me you will die!
If you drop me I'm sure to crack but give me a smile and I'll always smile back. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.